SDCFCF-002G-388 SanDisk, SDCFCF-002G-388 Datasheet - Page 65

• Manufacturer Part Number: SDCFCF-002G-388
• Description: COMPACT FLASH IND 2GB FIXED
• Manufacturer: SanDisk
• Type: CompactFlashr

Specifications of SDCFCF-002G-388

• Memory Size: 2GB
• Memory Type: CompactFLASH
• Density: 2GByte
• Operating Supply Voltage (typ): 3.3/5V
• Operating Temperature (min): 0C
• Operating Temperature (max): 70C
• Package Type: Not Required
• Mounting: Desktop
• Pin Count: 50
• Operating Temperature Classification: Commercial
• Operating Supply Voltage (min): 3.135/4.5V
• Operating Supply Voltage (max): 3.465/5.5V
• Programmable: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

SanDisk Industrial Grade CompactFlash 5000
Product Manual
Read Multiple–C4H
5.1.11
The Read Multiple command performs similarly to the Read Sectors command.
Interrupts are not generated on every sector, but on the transfer of a block
that contains the number of sectors defined by a Set Multiple command.
Table 53: Read DMA Command
Command execution is identical to the Read Sectors operation except that the
number of sectors defined by a Set Multiple command is transferred without
intervening interrupts. DRQ qualification of the transfer is required only at the
start of the data block, not on each sector.
The block count of sectors to be transferred without intervening interrupts is
programmed by the Set Multiple Mode command, which must be executed
prior to the Read Multiple command. When the Read Multiple command is
issued, the Sector Count Register contains the number of sectors (not the
number of blocks or the block count) requested. If the number of requested
sectors is not evenly divisible by the block count, as many full blocks as
possible are transferred, followed by a final, partial block transfer. The partial
block transfer is for n sectors, where: n = (sector count)-module (block
count).
If the Read Multiple command is attempted before the Set Multiple Mode
command has been executed, or when Read Multiple commands are disabled,
the Read Multiple operation is rejected with an Aborted Command error. Disk
errors encountered during Read Multiple commands are posted at the
beginning of the block or partial block transfer, but DRQ is still set and the
data transfer will take place as it normally would, including transfer of
corrupted data, if any.
Interrupts are generated when DRQ is set at the beginning of each block or
partial block. The error reporting is the same as that on a Read Sector(s)
Command. This command reads from 1 to 256 sectors as specified in the
Sector Count register. A sector count of 0 requests 256 sectors. The transfer
begins at the sector specified in the Sector Number Register.
On command completion, the Command Block registers contain the cylinder,
head and sector number of the last sector read.
If an error occurs, the read terminates at the sector where the error occurred.
The Command Block registers contain the cylinder, head and sector number of
the sector where the error occurred. The flawed data is pending in the sector
buffer.
Subsequent blocks or partial blocks are transferred only if the error was a
correctable data error. All other errors cause the command to stop after
transfer of the block that contained the error.
© 2007 SanDisk® Corporation
58
July 2007