Z80185 Datasheet, PDF (69/95 Pages) Zilog, Inc. – SMART PERIPHERAL CONTROLLERS

Zilog
PRELIMINARY
Z80185/Z80195
SMART PERIPHERAL CONTROLLES
Z80185 BIDIRECTIONAL CENTRONICS P1284 CONTROLLER (Continued)
Internal Data Bus
PARM
Register
State
Machine
State
Counter
PARC, PARC2
Registers
PART
Register
Time
Counter
RLE
Counter
Data Path
Clocking
PARV
Register
IEI
Interrupt
Logic
IEO
Output Holding
Register
PIA2 Direction
Register
PIA2 Data
Register
Data Path
Direction
Host/Peripheral
Control Signal
Management
nAck
Busy
PError
Select
nFault
nAutoFd
nStrobe
nSelectIn
nInit
PIA27-20
Figure 81. Bidirectional Centronics P1284 Controller
Functional Block Description
DS971850301
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