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CY7C25652KV18-500BZC Datasheet(PDF) 5 Page - Cypress Semiconductor |
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CY7C25652KV18-500BZC Datasheet(HTML) 5 Page - Cypress Semiconductor |
5 / 31 page CY7C25632KV18 CY7C25652KV18 Document Number: 001-66482 Rev. *D Page 5 of 31 Pin Definitions Pin Name I/O Pin Description D[x:0] Input- Synchronous Data Input Signals. Sampled on the rising edge of K and K clocks when valid write operations are active. CY7C25632KV18 D [17:0] CY7C25652KV18 D [35:0] WPS Input- Synchronous Write Port Select Active LOW. Sampled on the rising edge of the K clock. When asserted active, a write operation is initiated. Deasserting deselects the write port. Deselecting the write port ignores D[x:0]. BWS0, BWS1, BWS2, BWS3 Input- Synchronous Byte Write Select 0, 1, 2 and 3 Active LOW. Sampled on the rising edge of the K and K clocks when write operations are active. Used to select which byte is written into the device during the current portion of the write operations. Bytes not written remain unaltered. CY7C25632KV18 BWS 0 controls D[8:0] and BWS1 controls D[17:9]. CY7C25652KV18 BWS 0 controls D[8:0], BWS1 controls D[17:9], BWS2 controls D[26:18] and BWS3 controls D[35:27]. All the Byte Write Selects are sampled on the same edge as the data. Deselecting a Byte Write Select ignores the corresponding byte of data and it is not written into the device. A Input- Synchronous Address Inputs. Sampled on the rising edge of the K clock during active read and write operations. These address inputs are multiplexed for both read and write operations. Internally, the device is organized as 4 M × 18 (4 arrays each of 1 M × 18) for CY7C25632KV18 and 2 M × 36 (4 arrays each of 512 K × 36) for CY7C25652KV18. Therefore, only 20 address inputs for CY7C25632KV18 and 19 address inputs for CY7C25652KV18. These inputs are ignored when the appropriate port is deselected. Q[x:0] Outputs- Synchronous Data Output Signals. These pins drive out the requested data when the read operation is active. Valid data is driven out on the rising edge of the K and K clocks during read operations. On deselecting the read port, Q[x:0] are automatically tri-stated. CY7C25632KV18 Q [17:0] CY7C25652KV18 Q [35:0] RPS Input- Synchronous Read Port Select Active LOW. Sampled on the rising edge of positive input clock (K). When active, a read operation is initiated. Deasserting deselects the read port. When deselected, the pending access is allowed to complete and the output drivers are automatically tri-stated following the next rising edge of the K clock. Each read access consists of a burst of four sequential transfers. QVLD Valid Output Indicator Valid Output Indicator. The Q Valid indicates valid output data. QVLD is edge aligned with CQ and CQ. ODT [3] On-Die Termination Input Pin On-Die Termination Input. This pin is used for On-Die termination of the input signals. ODT range selection is made during power up initialization. A LOW on this pin selects a low range that follows RQ/3.33 for 175 < RQ < 350 (where RQ is the resistor tied to ZQ pin)A HIGH on this pin selects a high range that follows RQ/1.66 for 175 < RQ < 250 (where RQ is the resistor tied to ZQ pin). When left floating, a high range termination value is selected by default. K Input Clock Positive Input Clock Input. The rising edge of K is used to capture synchronous inputs to the device and to drive out data through Q[x:0]. All accesses are initiated on the rising edge of K. K Input Clock Negative Input Clock Input. K is used to capture synchronous inputs being presented to the device and to drive out data through Q[x:0]. CQ Echo Clock Synchronous Echo Clock Outputs. This is a free running clock and is synchronized to the input clock (K) of the QDR II+. The timings for the echo clocks are shown in the Switching Characteristics on page 24. CQ Echo Clock Synchronous Echo Clock Outputs. This is a free running clock and is synchronized to the input clock (K) of the QDR II+.The timings for the echo clocks are shown in the Switching Characteristics on page 24. ZQ Input Output Impedance Matching Input. This input is used to tune the device outputs to the system data bus impedance. CQ, CQ, and Q[x:0] output impedance are set to 0.2 × RQ, where RQ is a resistor connected between ZQ and ground. Alternatively, this pin can be connected directly to VDDQ, which enables the minimum impedance mode. This pin cannot be connected directly to GND or left unconnected. Note 3. On-Die Termination (ODT) feature is supported for D[x:0], BWS[x:0], and K/K inputs. |
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