Epson LQ 1050 Technical Manual - Page 193

A.1.2 Gate Array E05A15HA

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REV.-A A.1.2 Gate Array E05A15HA The E05A 15HA is a custom gate array used for address latching, address decoding, and automatic phase switching between two channels, and to control head data buffering. The features of this gate array are as follows: q Latches the low-order address for the PCOM87 series using the ALE signal. q Since it has two buffers for print data and automatically activates the half-dot protection circuit, it can protect the printhead from damage due to programming mistake or a malfunction. q Automatically switches the phases of the carriage motor and paper feed motor using the external clock signal. EM'Jl& CS4 CS3 CS2 CP4s 1 P3 P2 PI Po PFA PFB PFC PFD HDl HD2 HD3 HD4 HD5 HD6 HD7 HD8 N.C Vss PWD CRA CRB CRc CRD CTRGO Voo WC) DB7 DB6 DES DB4 DB3 DB2 DBl DBo Al A6 A5 A4 A3 CTRG+ ALE ;?T CTRGA2 Al AO A 15 A 14 A 13 A 12 HD9 A 14R A 13R RD 2 Figure A-6. GA E05A15HA Pin Diagram A-7

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REV.-A
A.1.2 Gate Array E05A15HA
The E05A 15HA is a custom gate array used for address latching, address decoding, and automatic
phase switching between two channels, and to control head data buffering. The features of this gate
array are as follows:
Latches the low-order address for the
PCOM87
series using the ALE signal.
Since it has two buffers for print data and automatically activates the half-dot protection circuit, it
can protect the printhead from damage due to programming mistake or a malfunction.
Automatically switches the phases of the carriage motor and paper feed motor using the external
clock signal.
EM’Jl&
CS4
CS3
CS2
Cs
1
P4
P3
P2
PI
Po
PFA
PFB
PFC
PFD
HDl
HD2
HD3
HD4
HD5
HD6
HD7
HD8
N.C
Vss
PWD
CRA
CRB
CRc
CRD
CTRGO
Voo
WC)
DB7
DB6
DES
DB4
DB3
DB2
DBl
DBo
Al
A6
A5
A4
A3
CTRG+
ALE
;?T
CTRG-
A2
Al
AO
A 15
A 14
A 13
A 12
HD9
A 14R
A 13R
RD
2
Figure A-6. GA E05A15HA Pin Diagram
A-7