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SPD6722QCCE Datasheet(PDF) 99 Page - Intel Corporation

Part No. SPD6722QCCE
Description  ISA-to-PC-Card (PCMCIA) Controllers
Download  138 Pages
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Maker  INTEL [Intel Corporation]
Homepage  http://www.intel.com
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SPD6722QCCE Datasheet(HTML) 99 Page - Intel Corporation

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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
DACKa
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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