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600X CompactFlash Card
Transcend Information Inc.
V1.0
19
Ultra DMA Electrical Requirements
Host and Card signal capacitance limits for Ultra DMA operation
The host interface signal capacitance at the host connector shall be a maximum of 25 pF for each signal as measured at
1 MHz.
The card interface signal capacitance at the card connector shall be a maximum of 20 pF for each signal as measured at
1 MHz.
Series termination required for Ultra DMA operation
Series termination resistors are required at both the host and the card for operation in any of the Ultra DMA modes. Table
describes typical values for series termination at the host and the device.
Table: Typical Series Termination for Ultra DMA
Signal Host Termination Device Termination
-HIOE (-HDMARDY,HSTROBE) 22 ohm 82 ohm
-IOWR (STOP) 22 ohm 82 ohm
-CS0, -CS1 33 ohm 82 ohm
A00, A01, A02 33 ohm 82 ohm
-DMACK 22 ohm 82 ohm
D15 through D00 33 ohm 33 ohm
DMARQ 82 ohm 22 ohm
INTRQ 82 ohm 22 ohm
IORDY (-DDMARDY, DSTROBE) 82 ohm 22 ohm
-RESET 33 ohm 82 ohm
NOTE Only those signals requiring termination are listed in this table. If a signal is not listed, series
termination is not required for operation in an Ultra DMA mode. Shows signals also requiring a pull-up or
pull-down resistor at the host. The actual termination values should be selected to compensate for transceiver
and trace impedance to match the characteristic cable impedance.