LUPXA255A0C200 Datasheet, PDF (35/40 Pages) Intel Corporation – Electrical, Mechanical, and Thermal Specification

Electrical Specifications
4.8
Memory Bus and PCMCIA AC Specifications
This section provides the timing information for these types of memory:
• SRAM / ROM / Flash / Synchronous Fast Flash Asynchronous writes (Table 19, “SRAM /
ROM / Flash / Synchronous Fast Flash AC Specifications” on page 35)
• Variable latency I/O (Table 20, “Variable Latency I/O Interface AC Specifications” on
page 35)
• Card interface (PCMCIA or Compact Flash) (Table 21, “Card Interface (PCMCIA or Compact
Flash) AC Specifications” on page 36)
• Synchronous memories (Table 22, “Synchronous Memory Interface AC Specifications 1” on
page 36)
Table 19. SRAM / ROM / Flash / Synchronous Fast Flash AC Specifications
Symbol
Description
MEMCLKs
tromAS MA(25:0) setup to nCS, nOE, nSDCAS (as nADV) asserted
1
tromAH ^{MA(25:0) hold after nCS, nOE, nSDCAS (as nADV) de-}
1
asserted
tromASW MA(25:0) setup to nWE asserted
3
tromAHW MA(25:0) hold after nWE de-asserted
1
tromCES nCS setup to nWE asserted
2
tromCEH nCS hold after nWE de-asserted
1
tromDS MD(31:0), DQM(3:0) write data setup to nWE asserted
1
tromDSWH MD(31:0), DQM(3:0) write data setup to nWE de-asserted
2
tromDH MD(31:0), DQM(3:0) write data hold after nWE de-asserted
1
tromNWE nWE high time between beats of write data
2
Table 20. Variable Latency I/O Interface AC Specifications
Symbol
Description
MEMCLKs
tvlioAS MA(25:0) setubp to nCS asserted
1
tvlioASRW MA(25:0) setup to nOE or nPWE asserted
1
tvlioAH MA(25:0) hold after nOE or nPWE de-asserted
1
tvlioCES nCS setup to nOE or nPWE asserted
2
tvlioCEH nCS hold after nOE or nPWE de-asserted
1
tvlioDSW MD(31:0), DQM(3:0) write data setup to nPWE asserted
1
tvlioDSWH
MD(31:0), DQM(3:0) write data setup to nPWE de-
asserted
2
tvlioDHW MD(31:0), DQM(3:0) hold after nPWE de-asserted
1
tvlioDHR MD(31:0) read data hold after nOE de-asserted
0
tvlioRDYH RDY hold after nOE, nPWE de-asserted
0
tvlioNPWE nPWE, nOE high time between beats of write or read data
2
Intel® PXA255 Processor Electrical, Mechanical, and Thermal Specification
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