TS8G~16GCF600 | 600X CompactFlash Card | |
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True IDE Ultra DMA Mode Read/Write Timing Specification
Ultra DMA operations can take place in any of the three basic interface modes: PC Card Memory mode, PC Card I/O mode, and True IDE (the original mode to support UDMA). The usage of signals in each of the modes is shown in Table 24:Ultra DMA Signal Usage In Each Interface Mode
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UDMA Signal | Type | UDMA MEM | |||
MODE UDMA | UDMA | ||||
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DMARQ | Output | 43 | |||
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HREG | Input | 44 | DMACK | ||
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HIOW | Input | 35 | STOP 1 | STOP 1 | |
HIOE | Input | 34 | |||
2HSTROBE(W) 1, 3, 4 | HSTROBE(W) 1, 3, 4 | ||||
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IORDY | Output | 42 | |||
DSTROBE(R) 1. 2. 4 | DSTROBE(R) 1. 2. 4 | ||||
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HD [15:0] | Bidir | … (D[15:00]) | D[15:00] | D[15:00] | |
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HA [10:0] | Input | … (A[10:00]) | A[10:00] | A[10:00] | |
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CSEL | Input | 39 | |||
HIRQ | Output | 37 (READY) | READY | ||
CE1 | Input | 7 | |||
CE2 | 31 | ||||
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TRUE IDE MODE
UDMA
DMARQ
-DMACK
STOP 1
D[15:00]
A[02:00] 5
-CSEL
INTRQ
Notes:1) The UDMA interpretation of this signal is valid only during an Ultra DMA data burst.
2)The UDMA interpretation of this signal is valid only during and Ultra DMA data burst during a DMA Read command.
3)The UDMA interpretation of this signal is valid only during an Ultra DMA data burst during a DMA Write command.
4)The HSTROBE and DSTROBE signals are active on both the rising and the falling edge.
5)Address lines 03 through 10 are not used in True IDE mode.
Several signal lines are redefined to provide different functions during an Ultra DMA data burst. These lines assume their UDMA definitions when:
1an Ultra DMA mode is selected, and
2a host issues a READ DMA, or a WRITE DMA command requiring data transfer, and
3 the device asserts
4 the host asserts
These signal lines revert back to the definitions used for
With the Ultra DMA protocol, the STROBE signal that latches data from D[15:00] is generated by the same agent (either host or device) that drives the data onto the bus. Ownership of D[15:00] and this data strobe signal are given either to the device during an Ultra DMA
During an Ultra DMA data burst a sender shall always drive data onto the bus, and, after a sufficient time to allow for propagation delay, cable settling, and setup time, the sender shall generate a STROBE edge to latch the data. Both edges of STROBE are used for data transfers so that the frequency of STROBE is limited to the same frequency as the data.
Words in the IDENTIFY DEVICE data indicate support of the Ultra DMA feature and the Ultra DMA modes the device is capable of supporting. The Set transfer mode subcommand in the SET FEATURES command shall be used by a host to select the Ultra DMA mode at which the system operates. The Ultra DMA mode selected by a host shall be less than or
Transcend Information Inc. | 31 |
V1.0