Series Termination Required For Ultra Dma; Figure 5.9 Ultra Dma Termination With Pull-Up Or Pull-Down; Table 5.15 Recommended Series Termination For Ultra Dma - Fujitsu MHC2032AT Product Manual

5.5.6 Series termination required for Ultra DMA

Series termination resistors are required at both the host and the device for
operation in any of the Ultra DMA Modes. The following table describes
recommended values for series termination at the host and the device.

Table 5.15 Recommended series termination for Ultra DMA

Signal
DIOR-:HDMARDY-:HSTROBE
DIOW-:STOP
CS0-, CS1-
DA0, DA1, DA2
DMACK-
DD15 through DD0
DMARQ
INTRQ
IORDY:DDMARDY-:DSTROBE
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.
For signals also requiring a pull-up or pull-down resistor at the host see Figure 5.9.
IORDY

Figure 5.9 Ultra DMA termination with pull-up or pull-down

Configuration of cable
For the configuration of the cable (common use of primary port and secondary
port), DMACK signal should not be used in common. It is not recommended to
use DIOR-, DIOW- and IORDY signal in common.
C141-E050-02EN
5.5 Ultra DMA Feature Set
Host Termination Device Termination
33 ohm
33 ohm
33 ohm
33 ohm
33 ohm
33 ohm 240 ohm (100 MHz)
82 ohm
82 ohm
82 ohm
DMARQ
82 ohm
82 ohm
82 ohm
82 ohm
82 ohm
33 ohm
33 ohm
22 ohm
5-91