Xerox FaxCentre F12, Service Manual

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Circuit Description
WorkCentre Pro 412, FaxCentre F12 & 3/03 5-53
WorkCentre M15/M15i
< Pin Classification and Loading >
• I: Input
• O: Output
• 3S: Tri-state output
• OD:Open drain output
• P:Power supply
Combinations indicate bidirectional pins.
An “H” in the Resistor column indicates the pad has an internal pull-up resistor.
A tilde (~) indicates no internal resistor.
OSTRB 1 L ~ O Output Buffer Strobe 50 4 4
PLL_B
YP 1 H ~ I Phase Locked Loop
Bypass ~ ~ ~
RA[15:0
] 16 H ~ O RAM Address 50 4 4
RAMO
E 1 L ~ O RAM Output Enable 50 4 4
RAMW
R I L ~ I RAM Write Enable 50 4 4
Name Pins
Leve
l
Resi
stor
Type Abbreviation/Description
Maximum Loading
Cap
.
(pF)
Current (mA)
Vol Voh
RD 1 L ~ I Command Port Read ~ ~ ~
RD [7:0] 8 H H 1/3S RAM Data 50 4 4
RE [1:0] 2 L ~ O RAM Enable 50 4 4
RESET 1 L H I Chip Reset ~ ~ ~
TESTIN 1 H ~ I Test Input ~ ~ ~
TEST-
OUT 1 H O Manufacturing Test Out-
put ~ ~ ~
VDD 22 N/A ~ P Power Supply Source ~ ~ ~
VDDBI
AS 1 N/A Input Reference Voltage
WR 1 L ~ I Command Port Write ~ ~ ~
RAMW
R I L ~ I RAM Write Enable 50 4 4
RD 1 L ~ I Command Port Read ~ ~ ~
RD [7:0] 8 H H 1/3S RAM Data 50 4 4
RE [1:0] 2 L ~ O RAM Enable 50 4 4