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FUJITSU DISK DRIVES MHM215OAT User Manual

Page 183

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Interface

5-106

C141-E104-02EN

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 5.17 Recommended series termination for Ultra DMA

Signal

Host Termination

Device Termination

DIOR-:HDMARDY-:HSTROBE

22

82

DIOW-:STOP

22

82

CS0-, CS1-

33

82

DA0, DA1, DA2

33

82

DMACK-

22

82

DD15 through DD0

33

120

(100 MHz)

DMARQ

82

22

INTRQ

82

22

IORDY:DDMARDY-:DSTROBE

82

22

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.

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.

Vcc

DMARQ

IORDY

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