Interface
[signal] | [I/O] |
| [Description] |
ENCSEL | I | This signal is used to set master/slave using the CSEL signal (pin 28). | |
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| Pins B and D Open: Sets master/slave using the CSEL signal | |
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| is disabled. |
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| Short: Sets master/slave using the CSEL signal |
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| is enabled. |
MSTR- | I | MSTR, I, Master/slave setting | |
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| Pin A, B, C, D open: Master setting | |
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| Pin A, B Short: | Slave setting |
RESET- | I | Reset signal from the host. This signal is low active and is | |
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| asserted for a minimum of 25 ∝ s during power on. | |
DATA | I/O | ||
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| device. These signals are used for data transfer | |
DIOW- | I | Signal asserted by the host to write to the device register or data | |
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| port. |
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STOP | I | DIOW- must be negated by the host before starting the Ultra | |
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| DMA transfer. The STOP signal must be negated by the host | |
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| before data is transferred during the Ultra DMA transfer. During | |
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| data transfer in Ultra DMA mode, the assertion of the STOP | |
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| signal asserted by the host later indicates that the transfer has been | |
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| suspended. |
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DIOR- | I | Read strobe signal from the host to read the device register or data | |
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| port |
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HDMARDY- | I | Flow control signal for Ultra DMA data In transfer (READ DMA | |
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| command). This signal is asserted by the host to inform the | |
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| device that the host is ready to receive the Ultra DMA data In | |
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| transfer. The host can negate the HDMARDY- signal to suspend | |
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| the Ultra DMA data In transfer. | |
HSTROBE | I | Data Out Strobe signal from the host during Ultra DMA data Out | |
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| transfer (WRITE DMA command). Both the rising and falling | |
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| edges of the HSTROBE signal latch data from Data | |
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| device. The host can suspend the inversion of the HSTROBE | |
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| signal to suspend the Ultra DMA data Out transfer. | |
INTRQ | O | Interrupt signal to the host. | |
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| This signal is negated in the following cases: |
−
−
−
−
−
assertion of RESET- signal
Reset by SRST of the Device Control register
Write to the command register by the host
Read of the status register by the host
Completion of sector data transfer
(without reading the Status register)
The signal output line has a high impedance when no devices are selected or interruption is disabled.