Z8536/Z85230 Registers; Table 1-20. Z8536/Z85230 Access Registers - Motorola MVME2600 Series Reference Manual

The Z8536 CIO is used to provide the modem control lines not provided
by the Z85230 ESCC and a method to inquire the module ID of the two
sync/async serial ports that reside on the MVME761 module. Refer to the
Z8536 Data Sheet for programming information.

Z8536/Z85230 Registers

Accesses to the Z8536 CIO and the Z85230 ESCC are accomplished via
Port Control and Port Data Registers. The PCLK to the Z8536 is 5 MHz.
Also, a Pseudo IACK Register is also defined to retrieve interrupt vectors
from these devices. The Z8536 CIO has higher priority than the Z85230
ESCC in the interrupt daisy chain. The following list the registers
associated with accessing these two devices:

Table 1-20. Z8536/Z85230 Access Registers

PCI I/O Address
0000 0840
0000 0841
0000 0842
0000 0843
0000 0844
0000 0845
0000 0846
0000 0847
0000 084F
Z85230: Port B (Serial Port 4) Control
Z85230: Port B (Serial Port 4) Data
Z85230: Port A (Serial Port 3) Control
Z85230: Port A (Serial Port 3) Data
Z8536 CIO: Port C's Data Register
Z8536 CIO: Port B's Data Register
Z8536 CIO: Port A's Data Register
Z8536 CIO: Control Register
Z85230/Z8536 Pseudo IACK
ISA Local Resource Bus
Function
1
1-45