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Video contoroller PCB Block Diagram
Figure 2-6-2
AIR
X´TAL
(14.37038MHz)
nVDO
X´TAL
(66.6666MHz)
CPUCLK (33.3MHz)
<J4> <J2/3>
for option
(72pin, 2slot)
for hard disk
(44pin, 2.1GB)
IOA [6:2]
IOD [11:0]
IOA [4:2]
IOA [23, 17:2]
for network board
(50pin, PSIO)
<J11>
<J6/7>
for option
(72pin, 2slot)
<J9>
<J8>
<J1>
ASIC
CPU
PPC603e (100/33)
for option controller
(20pin)
to host computer
(36pin)
to DC controller
(48pin)
CHAPTER 2
EEPROM
Option controller I/FEngine
RAM (8MB)
RAM DIMM
LVCR2245 ✕ 2
MA [10:0], nCAS [3:0], nWE
MD [31:0]
nRAS [7:0]
nA8 VDO
nA8 LSYNC, VCLK
Buffer
IEEE1284
LVTH245 ✕ 4 LVTH245 ✕ 4
LVCR2245 ✕ 2
LVCR2245 ✕ 2
LVC827 ✕ 2
MASK ROM
(4MB)
Firm DIMM
Extension I/O
Hard disk I/O
RESET
nRESET
nA0E
nGCS
nD0E
AD [31:0]
A [31:0]
D [31:0]
A [26:8]
ROM Cont.
ROM Cont.
ROM DIMM
ROM Cont.
I/O Cont.
IOA [23, 17:2]
IOD [15:0]
I/O Cont.
Cont.
I/O Cont.
: Operates at 5V
: 5V signals
Note
JTAG