FreeCalypso > hg > freecalypso-reveng
annotate sim-card-detect @ 393:6c31d8c54ae4
se_k200i: preliminary analysis
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 06 Nov 2022 01:13:43 +0000 |
parents | 82d5cc869bf1 |
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rev | line source |
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Mychaela Falconia <falcon@freecalypso.org>
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1 On the Mother's D-Sample board the SIM card status register (FFFE:0002) |
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Mychaela Falconia <falcon@freecalypso.org>
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2 reads: |
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Mychaela Falconia <falcon@freecalypso.org>
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3 |
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Mychaela Falconia <falcon@freecalypso.org>
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4 0x000A (CD bit 0) when the SIM socket is empty |
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Mychaela Falconia <falcon@freecalypso.org>
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5 0x000B (CD bit 1) when a card is inserted and the switch is shorted |
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Mychaela Falconia <falcon@freecalypso.org>
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6 |
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Mychaela Falconia <falcon@freecalypso.org>
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7 These register readings match CAL207 register document. |
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Mychaela Falconia <falcon@freecalypso.org>
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8 |
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Mychaela Falconia <falcon@freecalypso.org>
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9 On FCDEV3B Calypso SIM_CD input is tied high following Leonardo and Openmoko, |
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Mychaela Falconia <falcon@freecalypso.org>
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10 and the register reads 0x000B - thus we reach the conclusion that CAL000 |
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Mychaela Falconia <falcon@freecalypso.org>
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11 document is correct in that logic high on SIM_CD is supposed to indicate SIM |
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Mychaela Falconia <falcon@freecalypso.org>
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12 inserted, whereas logic low is supposed to indicate an empty SIM socket. |
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Mychaela Falconia <falcon@freecalypso.org>
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13 |
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Mychaela Falconia <falcon@freecalypso.org>
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14 However, the netlist extracted from the PADS PCB file for E-Sample (Calypso+ |
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Mychaela Falconia <falcon@freecalypso.org>
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15 chipset) shows the opposite arrangement: it shows a pull-up resistor to V-IO on |
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Mychaela Falconia <falcon@freecalypso.org>
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16 the SIM-CD net, and the switch in the SIM socket shorts this net to ground. |
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Mychaela Falconia <falcon@freecalypso.org>
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17 Perhaps the sense of this signal is inverted on Calypso+? We have no way of |
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Mychaela Falconia <falcon@freecalypso.org>
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18 knowing because we have no documentation for Calypso+, but we do know that its |
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Mychaela Falconia <falcon@freecalypso.org>
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19 ABB companion Syren reversed the sense of its test reset signal (relative to |
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Mychaela Falconia <falcon@freecalypso.org>
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20 Iota) for no apparent reason, hence such signal polarity reversals are not out |
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Mychaela Falconia <falcon@freecalypso.org>
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21 of the question. |