ZiLOG System 8000 Hardware Reference Manual

HRM Zilog
HRM
Status Words--The control bus contains a status word when
the direction line is deactivated for four possible standard
status words. Status Word O--Status Word 0 communicates
eight specific error conditions to the Controller-Formatter
when a fault condition exists.
Status Word 1--Status Word 1 signals seven different
error/exception conditions to the Controller-Formatter.
Status Words 2 and 3--Together cont~in the contents of the
Position Address Register (PAR) for current locations of the
heads.
Table 4-17. Disk Command and Status Words
..... 0
(MSB) QQ
(LSB)
~
~;~
Bit 1 Bit 6
Bit 5 Bit 4 Bit 3 Bit 2
Bit
1
Bit 0
QU
U
UNIT
UNIT
UNIT
UNIT
SPARE SPARE CARS'
CARS
WaRDa
100 ADDR3 ADDR2 ADDRI
ADORa
a·
a
C
WORD 1 1 a 1 CAR7
CAR6
CARS CAR4 CAR3
CAR2
CARl CARa
0
M
M
WORD 2 1 1 a
SERVO SERVO
STROBE STROBE SPARE
SPARE
HARl HARO
A
N
OFFSET
OFFSET
LATE EARLY a
a
D
REV
FWD
WORD 3 1 1
1
DIAG
CE
REZEHO
FAULT
SPARE SPARE
EXT EXT
MODE
MODE
CLEAR
PROTl
PROTu
WORD a
a a a
NOT SERVO R/W
SPEED PWR WRITE SEEKING
NC)T
READY ERROR FAULT
ERROR LOSS PROTO RZRNG
ON
S
CYL
T
WORD 1
a a 1
GUARD PLO
INVAL TIME PORI ILL
A
T
BAND ERROR UNSAFE CMND OUT
MR SPARE ADDR
U
S
WORD 2 a 1 a SPARE SPARE SPARE SPARE SPARE SPARE PAR9
PARS
WORD 3
a 1 1 .PAR7
PAR6
PARS
PAR4
PAR3
PAR2
PARI
PARO
4.5.3. storage Module Device Controller: The storage
Module Device Controller (SMDC) is a high performance con-
troller that links the ZBI system bus to each storage Module
Drive (SMD) interface board. The SMDC consists of two
boards (SMDCA and SMDCB). Board SMDC A is the ZBI control
signal connection to the I/O panel SMDCA OUT connector.
External cabling to SMDC A IN on the Disk/Tape Module con-
nects the ZBI signals through a 60-pin SMD A cable I/O con-
nector to the SMD Interface board. The SMDC B board is the
data I/O connection through I/O panel SMDC B OUT on the pro-
cessor and SMDC B IN on the Disk/Tape Modules. I/O Data to
and from the Processor Module is provided at the SMDC B
panel connectors that connect up to four 26-Pin SMD B cables
directly to the interface of each SMD drive. Local
4-26
Zilog
4-26

ZiLOG System 8000 Specifications

General

Brand	ZiLOG
Model	System 8000
Category	Desktop
Language	English