FreeCalypso > hg > gsm-net-reveng
comparison tcsm2-notes/trco @ 16:2daf8f209707
tcsm2-notes: initial observations on boards
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Wed, 29 May 2024 02:26:13 +0000 |
| parents | |
| children | 776229c5d640 |
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| 15:86a10ba0a1f8 | 16:2daf8f209707 |
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| 1 Major components on TRCO board: | |
| 2 | |
| 3 1x Lattice ispLSI1032E PLD, same as on TR16-S | |
| 4 1x CPU: Intel TN80C186EB20 | |
| 5 | |
| 6 1x really big oscillator component, labeled 16.384 MHz, likely OCXO | |
| 7 1x MAS9316N DAC close to it - likely TDM common clock for the system | |
| 8 | |
| 9 3x Infineon chips, 2x SAB 82525 (2x HDLC) and 1x SAB 82526 (1x HDLC): | |
| 10 the 5 HDLC channels which the available documentation touches on | |
| 11 | |
| 12 8x PLCC32 chips (9 pins on wide side, 7 pins on narrow side) with stickers | |
| 13 on them that obscure the markings underneath. The markings read IC45 through | |
| 14 IC48 in the top row of 4, IC55 through IC58 in the bottom row of 4. All 8 | |
| 15 ICs are directly soldered. Suspected flash memory. | |
| 16 | |
| 17 Next to these 8 ICs there is a socketed PLCC44 IC (11 pins on each side) | |
| 18 with a sticker that reads: | |
| 19 | |
| 20 TRCO | |
| 21 6.1-0 | |
| 22 TC1ROMQL | |
| 23 | |
| 24 It is clearly a programmed part of some kind, but not clear if it is flash | |
| 25 (boot code?) or some PLD or whatever. | |
| 26 | |
| 27 Further insight can be gained by peeling off the stickers, but I am not going | |
| 28 there yet: my current plan is to try powering this unit as-is and see if it | |
| 29 comes to life in a useful way. If it turns out to lack the needed fw, or lack | |
| 30 TFO feature, then proceed further with reverse eng. |