Z80382 Datasheet, PDF (32/77 Pages) Zilog, Inc. – HIGH-PERFORMANCE DATA COMMUNICATIONS PROCESSORS

Z80382/Z8L382
High-Performance Data Communications Processors
Zilog
PIN FUNCTIONS (Continued)
/RTS0
/RTS1
RXA0
RXA1
TXA0
TXA1
CKS
RXS
TXS
TOUT
Table 5. UART, Timer and CSIO Signals
88/93
94
52/90/99
55/67/103
51/91/98
54/87/102
58/64
57/63
56/62
46/109
Request to Send 0, 1 (Outputs, active Low, tri-state): Software-controlled output from the
ASCI channels.
Receive Data 0, 1 (Inputs): ASCI Receive data.
Transmit Data 0, 1 (Outputs): ASCI Transmit data.
Serial Clock (Bidirectional): The clock for the CSIO channel.
Clocked Serial Receive Data (Input): Receive data for the CSIO channel.
Clocked Serial Transmit Data (Output): Transmit data from the CSIO channel.
Timer Out (Output, active High): Pulse output from PRT1.
Pin Name
HD7-0
/HDOEN
HA11-0
HAEN
/HWR
/HRD
HINT1
HINT2
/HDAK0
/HDAK1
HDRQ0
HDRQ1
Table 6. ISA Bus Signals
Pin
Number(s)
Description
78 - 85
62
64 - 67
69 - 76
63
60
61
87
88
89
90
91
92
Host Data Bus (Input/Output, tri-state): ISA or PCMCIA data bus.
Host Data Output Enable (Output, active Low): This signal goes Low when the Host
reads data from the Mimic, the I/O Mailbox, or the Plug and Play interface, and during Host
DMA read cycles.
Host Address (Input): Part of the ISA or PCMCIA address bus. The MS bits can be de-
coded by the built-in address decoder; bits 2-0 determine which Mimic register the Host
accesses. Bits 11-10 are decoded only by the Plug and Play ISA module.
Host Address Enable (Input): HAEN must be Low to qualify COM Port decoding, I/O Mail-
box decoding, and Plug and Play decoding. To support 16-bit decoding of Host I/O ad-
dresses, provide an external decoder for HA15-12 and HAEN all Low and connect its Low-
active output to this pin.
Host Write (Input, active Low): The Host drives this input Low to signal the Mimic that a
write operation is taking place.
Host Read (Input, active Low): This input is used by the Host to signal the Mimic interface
that a read operation is taking place.
Host Interrupt (Outputs, active High): One of these outputs is driven High by the Plug and
Play module when the Mimic requests an interrupt from the Host. The unused signal is tri-
stated.
Host DMA Acknowledge (Inputs, active Low): These inputs indicate that the Host DMA
controller has acknowledged the request and is transferring data.
Host DMA Request (Outputs, active High, tri-state): These outputs request a DMA trans-
fer operation from the Host.
32
PRELIMINARY
DS97Z382000