Figure 6-4. Transmitter And Receiver Functional Diagram - Motorola MC68306 User Manual

TRANSMIT
BUFFER (TBA)
(2 REGISTERS)
BUFFER (RBA)
(4 REGISTERS)
TRANSMIT
BUFFER (TBB)
(2 REGISTERS)
BUFFER (RBB)
(4 REGISTERS)
NOTE:
R/W = READ/WRITE
R = READ
W = WRITE
. . . . . .

Figure 6-4. Transmitter and Receiver Functional Diagram

6-8
CHANNEL A
COMMAND REGISTER (CRA)
MODE REGISTER 1 (MR1A)
MODE REGISTER 2 (MR2A)
STATUS REGISTER (SRA)
TRANSMIT HOLDING REGISTER
TRANSMIT SHIFT REGISTER
RECEIVER HOLDING REGISTER 1
RECEIVER HOLDING REGISTER 2
RECEIVE
CHANNEL B
COMMAND REGISTER (CRB)
MODE REGISTER 1 (MR1B)
MODE REGISTER 2 (MR2B)
STATUS REGISTER (SRB)
TRANSMIT HOLDING REGISTER
TRANSMIT SHIFT REGISTER
RECEIVER HOLDING REGISTER 1
RECEIVER HOLDING REGISTER 2
RECEIVE
MC68306 USER'S MANUAL
RECEIVER HOLDING REGISTER 3
RECEIVER SHIFT REGISTER
RECEIVER HOLDING REGISTER 3
RECEIVER SHIFT REGISTER
EXTERNAL
INTERFACE
W
R/W
R/W
R
W
TxDA
FIFO
R
RxDA
W
R/W
R/W
R
W
TxDB
FIFO
R
RxDB
MOTOROLA