Task: Formula-prediction-context (source dataset: ti-random)

You are given an table region extracted from a real Excel spreadsheet, which is centered around a cell called "Target Cell" (labeled as "[Target Cell]" shown in the table below). The table region below includes up to 10 rows above/below the Target Cell, and 10 columns to the left/right of the Target Cell. 

Your task is to analyze the table context surrounding the Target Cell, and predict the most likely Excel formula that should go in the Target Cell. If multiple formulas are possible, choose the most reasonable or commonly used based on context.

1. Please follow the standard formula syntax in Excel, e.g. always begins with an equal sign (=).
2. Base your predicted formula on the surrounding table context, e.g., column headers, annotations, and data values in nearby cells.
3. No explanation — just output the formula itself in a JSON format: {"formula": "your_formula_here"}.

Input Excel Snippet in Markdown format:
|    | A   | B                                                                    | C                                                                                   | D                                 | E     | F     | G                                                                  | H   | I   | J   | K   | L   | M   | N   |
|---:|:----|:---------------------------------------------------------------------|:------------------------------------------------------------------------------------|:----------------------------------|:------|:------|:-------------------------------------------------------------------|:----|:----|:----|:----|:----|:----|:----|
| 30 |     |                                                                      | 7                                                                                   | PHY_DLL_LOCK_DIFF_VALUE           | 10    | -     |                                                                    |     |     |     |     |     |     |     |
| 31 |     |                                                                      |                                                                                     |                                   |       |       |                                                                    |     |     |     |     |     |     |     |
| 32 |     | 1B) DDR memory specifications:                                       |                                                                                     |                                   |       |       |                                                                    |     |     |     |     |     |     |     |
| 33 |     |                                                                      |                                                                                     |                                   |       |       |                                                                    |     |     |     |     |     |     |     |
| 34 |     |                                                                      | Detail                                                                              | Description                       | Value | Units |                                                                    |     |     |     |     |     |     |     |
| 35 |     |                                                                      | 6                                                                                   | Speed Bin: Data Rate              | 1866  | MT/s  | Note: Input the max rated data rate of the device,                 |     |     |     |     |     |     |     |
|    |     |                                                                      |                                                                                     |                                   |       |       |     not the operating speed.  Value is used to                     |     |     |     |     |     |     |     |
|    |     |                                                                      |                                                                                     |                                   |       |       |     determine the "JEDEC" values defined in                        |     |     |     |     |     |     |     |
|    |     |                                                                      |                                                                                     |                                   |       |       |     worksheet "Step2-DDR Timings".                                 |     |     |     |     |     |     |     |
| 36 |     |                                                                      | 7                                                                                   | Density (per device)              | 4     | Gb    |                                                                    |     |     |     |     |     |     |     |
| 37 |     |                                                                      | 8                                                                                   | Number of Rows                    | 15    | -     |                                                                    |     |     |     |     |     |     |     |
| 38 |     |                                                                      | 9                                                                                   | Number of Columns                 | 10    | -     |                                                                    |     |     |     |     |     |     |     |
| 39 |     |                                                                      | 10                                                                                  | Number of Banks                   | 8     | -     |                                                                    |     |     |     |     |     |     |     |
| 40 |     |                                                                      | 11                                                                                  | [Target Cell]                     | 13    | ntCK  | Note: Enter CAS Latency at the max rated speed of the device, not  |     |     |     |     |     |     |     |
|    |     |                                                                      |                                                                                     |                                   |       |       |     the operating speed.  The value not correspond to the actual   |     |     |     |     |     |     |     |
|    |     |                                                                      |                                                                                     |                                   |       |       |     CAS latency programmed to the EMIF.                            |     |     |     |     |     |     |     |
| 41 |     |                                                                      | 12                                                                                  | Width (per device)                | 16    | Bits  |                                                                    |     |     |     |     |     |     |     |
| 42 |     |                                                                      | 13                                                                                  | Average Periodic Refresh Interval | 7800  | ns    |                                                                    |     |     |     |     |     |     |     |
| 43 |     |                                                                      |                                                                                     |                                   |       |       |                                                                    |     |     |     |     |     |     |     |
| 44 |     | 1C) DDR memory I/O settings (termination / output driver impedance): |                                                                                     |                                   |       |       |                                                                    |     |     |     |     |     |     |     |
| 45 |     |                                                                      |                                                                                     |                                   |       |       |                                                                    |     |     |     |     |     |     |     |
| 46 |     |                                                                      | Detail                                                                              | Description                       | Value | Units | TI Recommendation**                                                |     |     |     |     |     |     |     |
| 47 |     |                                                                      | 14                                                                                  | ODT / Rtt_Nom                     | RZQ/4 | Ohms  | RZQ/4                                                              |     |     |     |     |     |     |     |
| 48 |     |                                                                      | 15                                                                                  | Dynamic ODT / Rtt_Wr              | RZQ/4 | Ohms  | RZQ/4                                                              |     |     |     |     |     |     |     |
| 49 |     |                                                                      | 16                                                                                  | Output Driver Impedance           | RZQ/7 | Ohms  | RZQ/6                                                              |     |     |     |     |     |     |     |
| 50 |     |                                                                      | ** NOTE: Users should check for recommendations provided by their DDR manufacturer. |                                   |       |       |                                                                    |     |     |     |     |     |     |     |



min_row: 30
max_row: 50
min_col: 1
max_col: 14
target_cell_row_idx: 40
target_cell_col_idx: 4
target_cell_value: Speed Bin: CAS Latency @ 1866MT/s data rate
formula: =CONCATENATE("Speed Bin: CAS Latency @ ", E35, "MT/s data rate")