Z80189 Datasheet, PDF (66/107 Pages) Zilog, Inc. – GENERAL-PURPOSE EMBEDDED CONTROLLERS

Zilog
PRELIMINARY
16550 MIMIC FIFO DESCRIPTION (Continued)
Z80189/Z8L189
GENERAL-PURPOSE EMBEDDED CONTROLLERS
MPU Write
LSR Shadow
B2-B4
error
3
3
PC Read
LSR
B2-B4
phi
MPU_RD
Sync
MPU
8
Databus
(MPU Side Write)
phi
MPU
IRQ
W
R
I
T
E
B
U
F
F
E
R
Write
Pointer
16x8
Data Bits
ALU
16x3 R
Error E
Bits A
D
B
U
F
F
E
R
Read
Pointer
phi
Sync
PC_RD
8
PC Side
Databus
(PC Side Read)
5
FIFO Control
Register
PC
IRQ
MPU Side
Interface
Figure 77. Receiver FIFO Block Diagram
16550
MIMIC or
PC Side
Interface
66
DS971890301