ICS TRIPLEX T3484 Drive input module

Each interface supports the CTS, DCD, RTS, and DTR control signals as well as the TxD and RxD transmit/receive data signals, and TxC/RxC synchronous clock signals. Since not all modem control lines are available in the Z85230, a Z8536 CIO is used to provide the missing modem lines. 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 PIB 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 PIB controller. Refer to the Z85230 data sheet and to the MVME2603/ MVME2604 Programmer’s Reference Guide, both listed in Appendix D, Related Documentation, for further information.

Z8536 CIO Device 

The Z8536 CIO device complements the Z85230 ESCC by supplying modem control lines not provided by the Z85230 ESCC. In addition, the Z8536 CIO device has three independent 16-bit counters/ timers. The Z85230 receives a 5 MHz clock input.MXDO is a time-multiplexed data output line from the main board and MXDI is a time-multiplexed line from the MVME761 module. MXCLK is a 10 MHz bit clock for the MXDO and MXDI data lines. MXSYNC∗ is asserted for one bit time at time slot 15 (Table 3-2) by the MVME2603/2604 base board. The MVME761 transition module uses MXSYNC∗ to synchronize with the base board.

P2 Signal Multiplexing 

Due to the limited supply of available pins in the P2 backplane connectors of MVME2603/2604 models that are configured for MVME761 I/O mode, certain signals are multiplexed through VMEbus connector P2 for additional I/O capacity. The signals affected are synchronous I/O control signals that pass between the base board and the MVME761 transition module. The multiplexing is a hardware function that is entirely transparent to software. Four signals are involved in the P2 multiplexing function: MXDO, MXDI, MXCLK, and MXSYNC∗.

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