Isa Dma Channels; Table 1-21. Pib Dma Channel Assignments - Motorola MTX Series Programmer's Reference Manual

Board Description and Memory Maps
1

ISA DMA Channels

PIB Priority
Highest
Lowest
1-32
Table 1-20. Two Wire Serial (I
2
I C Bus Address
1010000
1010001
1010010
1010011
There are seven ISA DMA channels in the PIB. Channels 0 through 3
support only 8-bit DMA devices while Channels 5 through 7 support only
16-bit DMA devices. These DMA channels are assigned as follows:

Table 1-21. PIB DMA Channel Assignments

PIB Label Controller
Channel 0 DMA1
Channel 1
Channel 2
Channel 3
Channel 4 DMA2
Channel 5
Channel 6
Channel 7
Note
Because the Z85230 is an 8-bit device and Channels 5 and 6 are
16-bit DMA Channels, only every other byte (the even bytes)
from memory is valid.
2
C) Bus Addresses
Function
Bank A lower DIMM
Bank A upper DIMM
Bank B lower DIMM
Bank B upper DIMM
DMA Assignment
Serial Port 3 Receiver (Z85230 Port A Rx)
Serial Port 3 Transmitter (Z85230 Port A Tx)
Floppy Drive Controller
Host Parallel Port
Not available - Cascaded from DMA1
Serial Port 4 Receiver (Z85230 Port B Rx)
Serial Port 4 Transmitter (Z85230 Port B Tx)
Peripheral Parallel Port
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