參數(shù)資料
型號： PD6710
廠商： Intel Corp.
英文描述： ISA-to-PC-Card (PCMCIA) Controllers
中文描述： ISA -到- PC卡（PCMCIA）的控制器
文件頁數(shù)： 84/138頁
文件大?。?/td> 723K
代理商： PD6710
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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