DZPD6722VCCE INTEL [Intel Corporation], DZPD6722VCCE Datasheet - Page 85

• Manufacturer Part Number: DZPD6722VCCE
• Description: ISA-to-PC-Card (PCMCIA) Controllers
• Manufacturer: INTEL [Intel Corporation]

11.2
Datasheet
Register Name: Command Timing 0–1
Index: 3Bh, 3Eh
1. Timing set 0 (index 3Bh) resets to 06h for socket timing equal to standard AT-bus-based cycle times. Timing set 1 (3Eh)
Command Prescalar Select
resets to 0Fh for socket timings equal to standard AT-bus timing using one additional wait state.
Bit 7
RW:00
Bits 7:6 — Setup Prescalar Select
This field chooses one of four prescalar values N
Multiplier Value (bits 5:0) to control the length of setup time before a command becomes active.
Command Timing 0–1
There are two separate Command Timing registers, each with identical fields. These registers are
located at the following indexes:
The Command Timing register for each timing set controls how long a PC Card cycle’s command
(that is, -OE, -WE, -IORD, -IOWR; see
number of internal clock cycles.
The overall command timing length C is programmed by selecting a 2-bit prescaling value (bits 7:6
of this register) representing weights of 1, 16, 256, or 8192, and then selecting a multiplier value
(bits 5:0) to which that prescalar is multiplied to produce the overall command timing length
according to the following formula:
The value of C, representing the number of internal clock cycles for a command, is then multiplied
by the internal clock’s period to determine the command active time (see
Calculations” on page 109
Bit 6
00
01
10
11
Index
3Bh
3Eh
N pres = 1
N pres = 16
N pres = 256
N pres = 8192
Bit 5
Command Timing
Command Timing 0
Command Timing 1
C = (N
pres
for further discussion).
N
Bit 4
val
) + 1
ISA-to-PC-Card (PCMCIA) Controllers — PD6710/’22
Table 2 on page
Command Multiplier Value
Bit 3
RW:000110/001111
pres
that are combined with the value of the Setup
20) active time will be, in terms of the
Bit 2
1
Register Compatibility Type: 365
“PC Card Bus Timing
Bit 1
Register Per: socket
Bit 0
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