![](/images/new-backgrounds/1223199/223199205x1.webp)
CHAPTER 2
Video contoroller PCB Block Diagram
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| for option |
| for network board |
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| (72pin, 2slot) |
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| (50pin, PSIO) |
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| <J4> | <J2/3> |
| <J11> |
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| Extension I/O |
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| Firm DIMM | ROM DIMM |
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| MASK ROM | ROM Cont. | ROM Cont. |
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| (4MB) |
| I/O Cont. |
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| JTAG |
| CPU | ROM Cont. |
| A [26:8] |
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| for hard disk |
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| PPC603e (100/33) |
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| [23, 17:2] |
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| (44pin, 2.1GB) |
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| LVC827 ✕ 2 |
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| Hard disk I/O |
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| D [31:0] |
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| IOA |
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| nRESET |
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| A [31:0] |
| I/O Cont. | [4:2] |
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| (33.3MHz) |
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| LVCR2245 ✕ 2 |
| IOA |
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| IOA [23, 17:2] |
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| RESET | nA0E | nD0E |
| IOD [15:0] |
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| CPUCLK | LVTH245 ✕ 4 |
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| LVTH245 ✕ 4 |
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| nGCS | LVCR2245 ✕ 2 | [6:2] | [11:0] |
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| IOA | IOD |
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| AD [31:0] |
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| I/F |
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| for option controller |
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| <J9> |
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| I/O Cont. |
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| Option controller | (20pin) | |
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| Cont. | nA8 LSYNC, VCLK |
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host computer |
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(36pin) | IEEE1284 | Buffer | ASIC |
| nA8 VDO |
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| EEPROM | |||||||
to |
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| AIR |
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| <J1> | ||
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| LVCR2245 ✕ 2 |
| X´TAL |
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| X´TAL |
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| nVDO |
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| MA [10:0], nCAS [3:0], nWE | (14.37038MHz) |
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| (66.6666MHz) |
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| MD [31:0] |
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| DC controller |
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| nRAS [7:0] |
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| Engine | (48pin) | |
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| Note | : Operates at 5V |
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| to |
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| : 5V signals | RAM (8MB) |
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| RAM DIMM |
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| <J6/7> |
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| for option |
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| (72pin, 2slot) |
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| Figure |
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