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Z80 Datasheet(PDF) 129 Page - Zilog, Inc. |
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Z80 Datasheet(HTML) 129 Page - Zilog, Inc. |
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129 / 330 page  < %27 2GTKRJGTCNU 7UGT /CPWCN UM008101-0601 Direct Memory Access 6. • 7. • 8. • RETI instruction Read Status Byte (BF) This command causes the next CPU read of the DMA to access the status byte, which is illustrated in “Read Registers” on page 114. If other read registers are being read, the sequence of reading (as defined by the read mask) must be completed before issuing this command. Reinitialize Status Byte (8B) This command reinitializes bits 4 and 5 of the status byte. After reinitial- ization, the status byte looks like this: The DISABLE DMA or any other command must be used before the REINITIALIZE STATUS BYTE command after having stopped on end-of- block or byte match. Due to a potential hardware race condition internal to Table 14. Reinitialize Status Byte Bit Value Meaning 0 I/O DMA operation has/has not occurred 1 I/O Ready line active/inactive 2 X Undefined bit 3 0/1 Interrupt pending/not pending 4 1 Match not found 5 1 Not end-of-block 6 X Undefined bit 7 X Undefined bit |
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