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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)： | 99/138頁 |
| 文件大?。?/td> | 723K |
| 代理商： | PD6710 |
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ISA-to-PC-Card (PCMCIA) Controllers
—
PD6710/
’
22
Datasheet
99
Notice that the DMA acknowledge to the card as -REG high is only active during the actual DMA
read or write card cycle. This means there is no mechanism to deassert DACK to the card: The card
must understand that receiving the first DMA cycle
is
its DMA acknowledgment.
15.4.2
Configuring the Socket Interface for I/O
For DMA support, bit 5 of the
Interrupt and General Control
register must be set to
‘
1
’
to put the
card interface in I/O Card Interface mode.
15.4.3
Preventing Dual Interpretation of DMA Handshake Signals
If the WP/-IOIS16 pin is being used as the DMA request line, the following should be considered:
1. Bit 4 of the
Interface Status
register is now the level of the DMA request line from the card.
2. Bit 5 of the socket
’
s two I/O Window Control registers should be set to
‘
0
’
.
If a socket
’
s BVD2/-SPKR pin is being used as the DMA request line, speaker or LED output from
that socket is not available.
If -INPACK is selected as the DMA request input, then bit 7 of the
Misc Control 1
register should
be set to
‘
0
’
to disable use of this signal as input acknowledge control.
Standard I/O Card
Interface Signal Name
DMA-Capable Card Interface
Signal Usage
When Signal Redefinition for DMA Interface
is Effective
-IOIS16
-IOIS16 or may be selected as the active-low
DMA request input
Extension Control 1
register bits 7-6 =
‘
10
’
(BVD2/)
-SPKR/-LED
-SPKR/-LED or may be selected as the active-
low DMA request input
Extension Control 1
register bits 7-6 =
‘
11
’
-INPACK
-INPACK or may be selected as the active-low
DMA request input
Extension Control 1
register bits 7-6 =
‘
01
’
-REG
-REG during standard cycles, active-high
DACK during DMA read/write cycles
Only during actual card DMA read or write
cycle
-OE
-OE during standard cycles, active-low -TC
during DMA write cycles
During DMA write cycles (that is, when -REG is
high and -IORD is low)
-WE
-WE during standard cycles, active-low -TC
during DMA read cycles
During DMA read cycles (that is, when -REG is
high and -IOWR is low)
Figure 17. Card DMA Request and Acknowledge Handshake with Terminal Count
-DREQ
DACK
a
PC Card
PD6722
-REG
-IOIS16, -SPKR, or -INPACK
-IOIS16, -SPKR, or -INPACK
-REG
a
A DMA cycle
is
the DMA acknowledge to the card.
-TC
-OE/-WE
-OE/-WE
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