Z16C30_08 Datasheet, PDF (13/102 Pages) Zilog, Inc. – CMOS USC Universal Serial Controller

Z16C30
Product Specification
9
RxACKA, RxACKB Receive Acknowledge (inputs or outputs, active Low)—The pri-
mary function of these signals is to perform fly-by DMA transfers from the receive FIFOs.
They may also be used as bit inputs or outputs.
TxDA, TxDB Transmit Data (outputs, active High, tri-state)—These signals carry the
serial transmit data for each channel.
RxDA, RxDB Receive Data (inputs, active High)—These signals carry the serial receive
data for each channel.
TxCA, TxCB Transmit Clock (inputs or outputs, active Low)—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.
RxCA, RxCB Receive Clock (inputs or outputs, active Low)—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 signals.
TxREQA, TxREQB Transmit Request (inputs or outputs, active Low)—The primary
function of these signals is to request DMA transfers to the transmit FIFOs. They may also
be used as simple inputs or outputs.
RxREQA, RxREQB Receive Request (inputs or outputs, active Low)—The primary
function of these signals is to request DMA transfers from the receive FIFOs. They may
also be used as simple inputs or outputs.
CTSA, CTSB Clear To Send (inputs or outputs, active Low)—These signals are used
as enables for the respective transmitters. They may also be programmed to generate inter-
rupts on either transition or used as simple inputs or outputs.
DCDA, DCDB Data Carrier Detect (inputs or outputs, active Low)—These signals are
used as enables for the respective receivers. They may also be programmed to generate
interrupts on either transition or used as simple inputs or outputs.
DS007902-0708
PRELIMINARY
Pin Description