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annotate tcsm2-notes/trco @ 19:4ab8762be333

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trau-ul-prep: starting with gsmx2tsrc program
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 23 Jun 2024 21:55:03 +0000
parents b36419bbc2c4
children
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2daf8f209707 tcsm2-notes: initial observations on boards
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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
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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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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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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???