AM8530H AMD [Advanced Micro Devices], AM8530H Datasheet - Page 14

• Manufacturer Part Number: AM8530H
• Description: Serial Communications Controller
• Manufacturer: AMD [Advanced Micro Devices]

AMD
1.4
The SCC pins are divided into seven functional groups: Address/Data, Bus Timing and
Reset, Device Control, Interrupt, Serial Data (both channels), Peripheral Control (both
channels), and Clocks (both Channels). Figures 1–3 and 1–4 show the pins in each func-
tional group for the 40- and 44-pin SCC versions.
The Address/Data group consists of the bidirectional lines used to transfer data between
the CPU and the SCC. The direction of these lines depends on whether the SCC is se-
lected and whether the operation is a Read or a Write.
The Timing and Control groups designate the type of transaction to occur and when this
transaction will occur. The Interrupt group provides inputs and outputs to conform to the
Z-Bus specifications for handling and prioritizing interrupts. The remaining groups are di-
vided into Channel A and Channel B groups for serial data (transmit or receive), peripher-
al control (such as DMA or Modem), and the input and output lines for the receive and
transmit clocks.
1–6
and Reset
Pin Functions
Data
Interrupt
Bus
Control
Timing
Bus
8
Figure 1–3. SCC Pin Functions
Am85C30/
INTACK
RD
WR
INT
IEI
IEO
Am8530H
CE
D/C
D 0 - D 7
A/B
+5 V
SCC
GND
DTR/REQA
DTR/REQB
PCLK
W/REQB
W/REQA
SYNCA
SYNCB
RTxCA
TRxCB
RTxCB
TRxCA
DCDB
DCDA
RTSB
CTSB
RxDB
RxDA
RTSA
CTSA
TxDB
TxDA
Serial
Data
Channel
Clocks
Channel
Controls
for Modem,
DMA, or
Other
Serial
Data
Channel
Clocks
Channel
Controls
for Modem,
DMA, or
Other
General Information
10216A-004A