SC28C94 Philips Semiconductors, SC28C94 Datasheet - Page 4

• Manufacturer Part Number: SC28C94
• Description: Quad universal asynchronous receiver/transmitter QUART
• Manufacturer: Philips Semiconductors

Philips Semiconductors
BLOCK DIAGRAM
1998 Aug 19
Quad universal asynchronous receiver/transmitter (QUART)
V
V
V
V
V
I/O[3:0]C
I/O[3:0]D
X1/CLK
DACKN
CC
SS1
SS2
SS3
SS4
RESET
IACKN
IRQN
A0–A5
TXDD
RXDC
D0–D7
TXDC
RXDD
WRN
RDN
CEN
X2
4
4
6
8
2
INTERRUPT ARBITRATION
OPERATION CONTROL
INTERRUPT CONTROL
POWER UP-DOWN
DUART CD
R/W CONTROL
GENERATOR
BUS BUFFER
OSCILLATOR
BAUD RATE
DUART AB
REGISTERS
ADDRESS
SAME AS
DECODE
CRYSTAL
GLOBAL
TIMING
LOGIC
LOGIC
IMR
ISR
CONTROL
TIMING
18
Figure 3. Block Diagram
INTERNAL DATA
BUS
4
8
DUART AB
FUNCTION SELECT
8 BYTE TRANSMIT
TRANSMIT SHIFT
RECEIVE SHIFT
RECEIVE FIFO
DETECTORS (4)
OUTPUT PORT
CHANGE-OF-
CHANNEL A
CHANNEL B
(AS ABOVE)
SELECTORS
INPUT PORT
REGISTER
REGISTER
COUNTER/
MR 0, 1, 2
8 BYTE
CSR Rx
CSR Tx
LOGIC
CLOCK
STATE
TIMING
TIMER
OPCR
FIFO
CTUR
IPCR
CTLR
ACR
CR
SR
ACR
1:0
4
4
Product specification
SC28C94
1:0
COMMON
DUART
AB
TxDA
RxDA
TxDB
RxDB
I/O[3:0]B
I/O[3:0]A
SD00160