Series Termination Required For Ultra Dma; Ultra Dma Termination With Pull-Up Or Pull-Down; Recommended Series Termination For Ultra Dma - Fujitsu MPE3XXXAT Product Manual

I) The CRC generator polynomial is : G (X) = X16 + X12 + X5 + 1.
Note: Since no bit clock is available, the recommended approach for calculating CRC is
to use a word clock derived from the bus strobe. The combinational logic shall then be
equivalent to shifting sixteen bits serially through the generator polynominal where DD0 is
shifted in first and DD15 is shifted in last.
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.
termination at the host and the device.
Table 5.15 Recommended series termination for Ultra DMA
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 5.7.
*1: "A.I." means an Active Inductance.
Figure 5.7
5 - 84
The following table describes recommended values for series
Signal Host Termination

Ultra DMA termination with pull-up or pull-down

C141-E077-01EN
Device Termination
33 ohm 120 ohm A.I.
33 ohm 82 ohm
33 ohm 82 ohm
33 ohm 82 ohm
33 ohm 82 ohm
33 ohm 120 ohm A.I.
82 ohm 22 ohm
82 ohm 22 ohm
82 ohm 22 ohm
*1
*1