It operates at a 250 MHz clock frequency.
250 MHz QDR II — what the clock rate means for the bus
At 250 MHz, the QDR II interface presents separate read and write data ports, each operating at double data rate (DDR).

Infineon CY7C1315KV18-250BZXC, SRAM - Synchronous QDR II, 18Mbit, 512K x 36, Parallel, 1.7V~1.9V, 250 MHz, 165-LBGA (13x15mm), 0°C~70°C, Tray.
| Parameter | Value |
|---|---|
| Memory type | Volatile |
| Mounting | Surface Mount |
| Voltage | 1.7V ~ 1.9V |
| Frequency | 250 MHz |
| Memory interface | Parallel |
| Operating temperature | 0°C~70°C(TA) |
| Package | Tray |
| Technology | SRAM - Synchronous, QDR II |
| Memory size | 18Mbit |
| Memory format | SRAM |
| Case | 165-LBGA |
| Memory organization | 512K x 36 |
It operates at a 250 MHz clock frequency.
At 250 MHz, the QDR II interface presents separate read and write data ports, each operating at double data rate (DDR).
The speed grade is 250 MHz, which is the maximum clock frequency for the QDR II interface.