參數(shù)資料
型號: DZPD6710VCB
廠商: INTEL CORP
元件分類: 總線控制器
英文描述: ISA-to-PC-Card (PCMCIA) Controllers
中文描述: PCMCIA BUS CONTROLLER, PQFP144
封裝: LQFP-144
文件頁數(shù): 84/138頁
文件大小: 723K
代理商: DZPD6710VCB
PD6710/
22
ISA-to-PC-Card (PCMCIA) Controllers
84
Datasheet
11.0
Timing Registers
The following information about the timing registers is important:
All timing registers take effect immediately and should only be changed when the FIFO is
empty (see the
FIFO Control
register on
FIFO Control
on page 72
).
Selection of Timing 0 or Timing 1 register sets is controlled by
I/O Window Control
, bit 3
and/or bit 7 (see
I/O Window Control
on page 58
).
11.1
Setup Timing 0
1
There are two separate Setup Timing registers, each with identical fields. These registers are
located at the following indexes:
I
ndex
3Ah
3Dh
Setup Timing
Setup Timing 0
Setup Timing 1
The Setup Timing register for each timing set controls how long a PC Card cycle
s command (that
is, -OE, -WE, -IORD, -IOWR; see
Table 2 on page 20
) setup will be, in terms of the number of
internal clock cycles.
The overall command setup number of clocks
S
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
setup timing length according to the following formula:
S
= (
N
pres
×
N
val
) + 1
The value of
S
, representing the number of internal clock cycles for command setup, is then
multiplied by the internal clock
s period to determine the command setup time (see
PC Card Bus
Timing Calculations
on page 109
for further discussion).
Bits 5:0
Setup Multiplier Value
This field indicates an integer value
N
val
from 0 to 63; it is combined with a prescalar value (bits
7:6) to control the length of setup time before a command becomes active.
Register Name:
Setup Timing 0
1
Index:
3Ah, 3Dh
Register Per:
socket
Register Compatibility Type:
365
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Setup Prescalar Select
Setup Multiplier Value
RW:00
RW:000001
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