P R E L I M I N A R Y | AMD |
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Note that a read of the USERDT[0] bit (TIR29[0]) will al- ways give the current USER0/RFRSH pin value, regard- less of pin configuration setting.
Pin 91: USER1/IRQ12/EXTCTS/EXINT188
The USER1/IRQ12 pin may be configured for input operation, output operation, or ISA IRQ12 operation ac- cording to the following table:
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| USER1/ | USER1/ |
PCMCIA | USER1EN | IRQ Select | IRQ Type | IRQ12 | IRQ12 |
Pin | TCR14[1] | PnPx70 | PnPx71 | Pin Direction | Pin Data |
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0 | X | Ch | 2h | O | IRQ12 |
0 | X | Ch | 1h | OD | IRQ12 |
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0 | 0 | ≠Ch | X | I | NA |
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0 | 1 | ≠Ch | X | O | TIR29[1] |
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1 | 0 | X | X | I | NA |
1 | 1 | X | X | O | TIR29[1] |
Note that a read of the USERDT[1] bit (TIR29[1]) will al- ways give the current USER1/IRQ12 pin value, regard- less of pin configuration setting.
In addition to the functionality listed above, the USER1/IRQ12/EXTCTS/EXINT188 pin may be used to enable the internal TX state machine. This capability is controlled by the CTSEN bit of TCR7 and operates inde- pendently of the table above and independently of the U1INTCNT bits of TCR7. When the CTSEN bit of TCR7 is set to 1, then the value of the USER1/IRQ12/ EXTCTS/EXINT188 pin will be ANDed with the value of the TXS bit of TIR8. The output of the AND gate will then be used to determine the start of the TX state machine. In this way, an external signal, through the USER1/IRQ12/EXTCTS/EXINT188 input, can be used
to control the start of the TX state machine, provided that Am79C930 device firmware has enabled the operation by setting the TXS bit of TIR8.
In addition to the functionality listed above, the USER1/IRQ12/EXTCTS/EXINT188 pin may be used to produce interrupts to the 80188 embedded controller. This capability is controlled by the U1INTCNT bits of TCR7 and operates independently of the bits in the table above and independently of the CTSEN bit of TCR7.Interrupts that are routed through the USER1/IRQ12/EXTCTS/EXINT188 pin are indicated in the U1INT bit of TCR11. The following table lists the pro- gramming options for using the USER1/IRQ12/ EXTCTS/EXINT188 pin as a source of external interrupt to the 80188 controller.
U1INTCNT | USER1 Pin | U1INT Bit |
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TCR7[4:3] | Event | Result (TCR11[3]) |
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00 | X | 0 => interrupt disabled | reset default condition |
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01 | rising edge | 1 => interrupt signalled |
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10 | falling edge | 1 => interrupt signalled |
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11 | rising or falling edge | 1 => interrupt signalled |
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Pin 92: USER7/IRQ11
The USER7/IRQ11 pin may be configured for input op- eration, output operation, or ISA IRQ11 operation ac- cording to the following table:
Note that a read of the USER7DL bit (TIR29[7]) will al- ways give the current USER7/IRQ11 pin value, regard- less of pin configuration setting.
USER7DL (TIR29[7]) gives the current value of the USER7/IRQ11 pin.
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| USER7/ | USER7/ |
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PCMCIA | USER7FN | USER7EN | IRQ Select | IRQ Type | IRQ11 | IRQ11 |
Pin | TC30[7] | TCR14[7] | PnPx70 | PnPx71 | Pin Direction | Pin Data |
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0 | 0 | X | Bh | 2h | O | IRQ11 |
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0 | 0 | X | Bh | 1h | OD | IRQ11 |
0 | 0 | X | ≠Bh | X | I | NA |
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0 | 1 | X | X | X | I | NA |
1 | 0 | 0 | X | X | I | NA |
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1 | 0 | 1 | X | X | O | TIR29[7] |
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1 | 1 | X | X | X | I | NA |
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| Am79C930 |
| 35 | |
