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CY7C1441KV25 Datasheet(PDF) 6 Page - Cypress Semiconductor |
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CY7C1441KV25 Datasheet(HTML) 6 Page - Cypress Semiconductor |
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6 / 29 page  Document Number: 001-94722 Rev. *E Page 6 of 29 CY7C1441KV25 Functional Overview All synchronous inputs pass through input registers controlled by the rising edge of the clock. Maximum access delay from the clock rise (tCDV) is 6.5 ns (133 MHz device). The CY7C1441KV25 supports secondary cache in systems utilizing either a linear or interleaved burst sequence. The interleaved burst order supports Pentium processors. The burst order is user selectable and is determined by sampling the MODE input. Accesses are initiated with either ADSP or ADSC. Address advancement through the burst sequence is controlled by the ADV input. A two-bit on-chip wraparound burst counter captures the first address in a burst sequence and automatically increments the address for the rest of the burst access. Byte write operations are qualified with the Byte Write Enable (BWE) and Byte Write Select (BWx) inputs. A Global Write Enable (GW) overrides all byte write inputs and writes data to all four bytes. All writes are simplified with on-chip synchronous self timed write circuitry. Three synchronous chip selects (CE1, CE2, CE3) and an asynchronous output enable (OE) provide for easy bank selection and output tri-state control. ADSP is ignored if CE1 is HIGH. Single Read Accesses A single read access is initiated when the following conditions are satisfied at clock rise: (1) CE1, CE2, and CE3 are all asserted active and (2) ADSP or ADSC is asserted LOW (if the access is initiated by ADSC, the write inputs must be deasserted during this first cycle). The address presented to the address inputs is latched into the address register and the burst counter or control logic and presented to the memory core. If the OE input is asserted LOW, the requested data is available as the data outputs a maximum to tCDV after clock rise. ADSP is ignored if CE1 is HIGH. Single Write Accesses Initiated by ADSP This access is initiated when the following conditions are satisfied at clock rise: (1) CE1, CE2, CE3 are all asserted active and (2) ADSP is asserted LOW. The addresses presented are loaded into the address register and the burst inputs (GW, BWE, and BWX) are ignored during this first clock cycle. If the write inputs are asserted active (see Truth Table on page 8 for appropriate states that indicate a write) on the next clock rise, the appropriate data is latched and written into the device. Byte writes are allowed. All I/Os are tri-stated during a byte write. Because this is a common I/O device, the asynchronous OE input signal must be deasserted and the I/Os must be tri-stated prior to the presentation of data to DQs. As a safety precaution, the data lines are tri-stated when a write cycle is detected, regardless of the state of OE. MODE Input-Static Selects Burst Order. When tied to GND selects linear burst sequence. When tied to VDD or left floating selects interleaved burst sequence. This is a strap pin and should remain static during device operation. Mode pin has an internal pull up. VDD Power Supply Power Supply Inputs to the Core of the Device. VDDQ I/O Power Supply Power Supply for I/O Circuitry. VSS Ground Ground for the Core of the Device. VSSQ I/O Ground Ground for I/O Circuitry. TDO JTAG Serial Output Synchronous Serial Data-Out to the JTAG Circuit. Delivers data on the negative edge of TCK. If the JTAG feature is not utilized, this pin should be left unconnected. TDI JTAG Serial Input Synchronous Serial Data-In to the JTAG Circuit. Sampled on the rising edge of TCK. If the JTAG feature is not utilized, this pin can be left floating or connected to VDD through a pull up resistor. TMS JTAG Serial Input Synchronous Serial Data-In to the JTAG Circuit. Sampled on the rising edge of TCK. If the JTAG feature is not utilized, this pin can be disconnected or connected to VDD. TCK JTAG-Clock Clock Input to the JTAG Circuitry. If the JTAG feature is not utilized, this pin must be connected to VSS. NC – No Connects. Not internally connected to the die. NC/72M, NC/144M, NC/288M, NC/576M, NC/1G – No Connects. Not internally connected to the die. NC/72M, NC/144M, NC/288M, NC/576M, and NC/1G are address expansion pins and are not internally connected to the die. Pin Definitions (continued) Name I/O Description |
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