Z16C30 Datasheet, PDF (8/86 Pages) Zilog, Inc. – CMOS USC Universal Controller

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IEI signal for each channel is used with the accompanying
IEO signal to form an interrupt daisy chain. An active IEI
indicates that no device having higher priority is requesting
or servicing an interrupt.
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The IEO signal for each channel is used with the accompa-
nying IEI signal to form an interrupt daisy chain. IEO is Low
if IEI is Low, an interrupt is under service in the channel,
or an interrupt is pending during an interrupt acknowledge
cycle.
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QWVRWVU CEVKXG .QY The primary function of these sig-
nals is to perform fly-by DMA transfers to the transmit
FIFOs. They may also be used as bit inputs or outputs.
4Z#%-# 4Z#%-$ 4GEGKXG #EMPQYNGFIG KPRWVU QT
QWVRWVU CEVKXG .QY The primary function of these sig-
nals is to perform fly-by DMA transfers from the receive
FIFOs. They may also be used as bit inputs or outputs.
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UVCVG These signals carry the serial transmit data for each
channel.
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signals carry the serial receive data for each channel.
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.QY These signals are used as clock inputs for any of the
functional blocks within the device. They may also be used
as outputs for various transmitter signals or internal clock
signals.
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.QY These signals are used as clock inputs for any of the
functional blocks within the device. They may also be used
as outputs for various receiver signals or internal clock sig-
nals.
6Z4'3# 6Z4'3$ 6TCPUOKV 4GSWGUV KPRWVU QT QWVRWVU
CEVKXG .QY The primary function of these signals is to re-
quest DMA transfers to the transmit FIFOs. They may also
be used as simple inputs or outputs.
4Z4'3# 4Z4'3$ 4GEGKXG 4GSWGUV KPRWVU QT QWVRWVU
CEVKXG .QY The primary function of these signals is to re-
quest DMA transfers from the receive FIFOs. They may
also be used as simple inputs or outputs.
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.QY These signals are used as enables for the respective
transmitters. They may also be programmed to generate in-
terrupts on either transition or used as simple inputs or out-
puts.
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CEVKXG .QY These signals are used as enables for the re-
spective receivers. They may also be programmed to gen-
erate interrupts on either transition or used as simple inputs
or outputs.

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