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PD6710 Datasheet, PDF (104/138 Pages) Intel Corporation – ISA-to-PC-Card (PCMCIA) Controllers | |||
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PD6710/â22 â ISA-to-PC-Card (PCMCIA) Controllers
16.3
AC Timing Specifications
This section includes system timing requirements for the PD67XX. Timings are provided in
nanoseconds (ns), at TTL input levels, with the ambient temperature varying from 0°C to 70°C,
and VCC varying from 3.0 to 3.6 V or 4.5 to 5.5 V DC. The AT bus speed is 10 MHz unless
otherwise noted. Note that an asterisk (*) denotes an active-low signal for the ISA bus interface,
and a dash (-) denotes an active-low signal for the PC Card socket interface.
⢠Additionally, the following statements are true for all timing information:
⢠All timings assume a load of 50 pF.
⢠TTL signals are measured at TTL threshold; CMOS signals are measured at CMOS threshold.
Table 25. List of AC Timing Specifications
Title
Table 26 âISA Bus Timingâ
Table 27 âReset Timingâ
Table 28 âPulse Mode Interrupt Timingâ
Table 29âGeneral-Purpose Strobe Timingâ
Table 30 âInput Clock Specificationâ
Table 31 âMemory Read/Write Timing (Word Access)â
Table 32 âWord I/O Read/Write Timingâ
Table 33 âPC Card Read/Write Timing when System Is 8-Bitâ
Table 34 âNormal Byte Read/Write Timingâ
Table 35 â16-Bit System to 8-Bit I/O Card: Odd Byte Timingâ
Table 36 âDMA Read Cycle Timing (PD6722 only)â
Table 37 âDMA Write Cycle Timing (PD6722 only)â
Table 38 âDMA Request Timing (PD6722 only)â
Page Number
104
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16.4
ISA Bus Timing
Table 26. ISA Bus Timing (Sheet 1 of 2)
Symbol
Parameter
MIN
MAX
Unit
t1
MEMCS16* active delay from LA[23:17] valid
40
ns
t1a
LA[23:17] setup to ALE inactive
30
ns
t1b
LA[23:17] hold from ALE inactive
t2
IOCS16* active delay from SA[15:0]1
5
ns
40
ns
1. AEN must be inactive for t2, t3, and t6 timing specifications to be applicable.
2. Command is defined as IOR*, IOW*, MEMR*, or MEMW*.
3. Except for valid card memory writes, which are zero wait state when internal write FIFO is not full.
4. If card is removed during a card access cycle, IOCHRDY is three-stated without waiting for end of Command.
5. Based on 25-MHz internal clock, produced either by an internal synthesizer and 14.318-MHz signal applied to CLK pin, or by
supplying 25 MHz directly to CLK pin and bypassing the internal synthesizer.
104
Datasheet
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