Block Diagram
3-16
3
In the MVME1600-001 base board, all modem control lines from the
ESCC are multiplexed/demultiplexed through P2 by a multiplexing
function (P2MX, described later in this chapter) due to the pin limitations
of the P2 connector.
A PAL device performs decoding of register accesses and pseudo interrupt
acknowledge cycles for the Z85230 and the Z8536 in ISA I/O space. The
ISA bridge controller supplies DMA support for the Z85230.
The Z85230 receives a 10MHz clock input. The Z85230 supplies an
interrupt vector during pseudo interrupt acknowledge cycles. The vector
is modified within the Z85230 according to the interrupt source. Interrupt
request levels are programmed via the ISA bridge controller. Refer to the
Z85230 data sheet and to the MVME1603/ MVME1604 Programmer’s
Reference Guide for further information.
Z8536 CIO Device
The Z8536 CIO device complements the Z85230 ESCC by supplying
signals for Abort interrupt status, fuse status, and SCSI terminator status
and control, as well as furnishing modem control lines not provided by the
Z85230 ESCC. In addition, the Z8536 CIO device has three independent
16-bit counters/timers.
For MVME1600-001 base boards, the Z8536 CIO device also provides a
means of requesting the module ID of the two synchronous/asynchronous
serial ports that reside on the MVME760 transition module. Refer to the
Z8536 data sheet and to the MVME1603/MVME1604 Programmer’s
Reference Guide for further information.
Board Configuration Register
The Board Configuration Register is an 8-bit read-only register containing
the details of the MVME1603/MVME1604 single-board computer’s
configuration. This register is located on the base board at ISA I/O address
$0802.
Board Configuration Register - $0802
BIT
SD7
SD6
SD5
SD4
SD3
SD2
SD1
SD0
Содержание MVME1603
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