FreeCalypso > hg > gsm-net-reveng
annotate tcsm2-notes/trco @ 28:9bcdb091c24d default tip
trau-decode: new program trau-hr-dump
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 18 Aug 2024 08:37:02 +0000 |
parents | b36419bbc2c4 |
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rev | line source |
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tcsm2-notes: initial observations on boards
Mychaela Falconia <falcon@freecalypso.org>
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1 Major components on TRCO board: |
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2 |
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3 1x Lattice ispLSI1032E PLD, same as on TR16-S |
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4 1x CPU: Intel TN80C186EB20 |
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5 |
18
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6 Big oscillator, markings on the metal can package: |
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7 |
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8 DFA 36-TR |
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9 16.384 MHz |
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10 A36060 0049 |
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11 |
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12 Close to it there is a MAS9316N DAC - thus the big oscillator is likely the |
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13 system-wide TDM clock (the one that can be synced to various inputs), and the |
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14 DAC is for control loop adjustments aiming to lock this oscillator to the |
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15 selected external clock source. Based on the size of the can, I originally |
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16 thought it was an OCXO, but when I searched for "DFA 36-TR", the hits I got |
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17 (only sellers, no datasheet) say TCXO. Who knows... |
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18 |
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19 3x Infineon chips, 2x SAB 82525 (2x HDLC) and 1x SAB 82526 (1x HDLC): |
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20 the 5 HDLC channels which the available documentation touches on. |
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21 |
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22 8x PLCC32 chips (9 pins on wide side, 7 pins on narrow side) with stickers |
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23 on them that obscure the markings underneath. The markings read IC45 through |
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24 IC48 in the top row of 4, IC55 through IC58 in the bottom row of 4. All 8 |
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25 ICs are directly soldered. Suspected flash memory. |
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26 |
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27 Update with IC55 sticker peeled off: the IC underneath is AM29F010B-120JC, |
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28 just like I suspected. Interestingly, it also says "(C) 1998 AMD" - the year |
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29 is slightly newer than my original assumptions of 1996 vintage. |
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30 |
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31 Next to these 8 ICs there is a socketed PLCC44 IC (11 pins on each side) |
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32 with a sticker that reads: |
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33 |
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34 TRCO |
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35 6.1-0 |
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36 TC1ROMQL |
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37 |
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38 It is clearly a programmed part of some kind, but not clear if it is flash |
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39 (boot code?) or some PLD or whatever. |
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40 |
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41 Update after peeling off the sticker: the part is ST M27C4002, an OTP ROM! |
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42 It is clearly the boot PROM, whereas the other 8 ICs (all 29F010?) are the |
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43 flash memory array. The large size of both the flash array and the boot PROM |
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44 is surprising: |
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45 |
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46 * The boot PROM is 4 Mbit (256K x 16) - that's 512 KiB, half of 80186 address |
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47 space if fully and directly mapped. |
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48 |
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49 * Assuming that the 8 bit wide 29F010 chips are wired in pairs across the |
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50 16 bit wide data bus, we got 1 MiB in total, in 4 banks of 256 KiB each. |
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51 More than 80186 can address directly - is it a bank-switched memory system? |
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52 |
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53 RAM chips: |
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54 |
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55 * 2x Samsung K6T1008C2E-GL70. Each of these ICs is 128K x 8 static RAM; |
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56 the design probably uses two of them across the 16 bit wide data bus. |
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57 256 KiB of RAM here. |
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58 |
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59 * 1x CY62256-70SNC - 32K x 8 (256 Kbit) static RAM. What is it for??? |