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8-18 PXA250 and PXA210 Applications Processors Design Guide
Power and Clocking
Table 8-15. SRAM / ROM / Flash / Synchronous Fast Flash AC Specifications (2.5 V)
Symbol Description
MEMCLK Frequency (MHz)
Notes
99.5 118.0 132.7 147.5 165.9
SRAM / ROM / Flash / Synchronous Fast Flash (WRITES) (Asynchronous)
tromAS
MA(25:0) setup to nCS, nOE, nSDCAS (as nADV)
asserted
TBD
tromAH
MA(25:0) hold after nCS, nOE, nSDCAS (as nADV)
deasserted
tromASW MA(25:0) setup to nWE asserted
tromAHW MA(25:0) hold after nWE deasserted
tromCES nCS setup to nWE asserted
tromCEH nCS hold after nWE deasserted
tromDS MD(31:0), DQM(3:0) write data setup to nWE asserted
tromDSWH
MD(31:0), DQM(3:0) write data setup to nWE
deasserted
tromDH
MD(31:0), DQM(3:0) write data hold after nWE
deasserted
tromNWE nWE high time between beats of write data
NOTES:
1. This number represents 1 MEMCLK period
2. This number represents 3 MEMCLK periods
3. This number represents 2 MEMCLK periods