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S3C2416X RISC MICROPROCESSOR
HSMMC CONTROLLER
20-39
Name
Bit
Description
Initial Value
This bit is used to stop executing a transaction at the next block gap for
both DMA and non-DMA transfers. Until the
Transfer Complete
is set to
1, indicating a transfer completion the Host Driver shall leave this bit set
to 1.
Clearing both the
Stop At Block Gap Request
and
Continue Request
shall not cause the transaction to restart. Read Wait is used to stop the
read transaction at the block gap. The Host Controller shall honor
Stop
At Block Gap Request
for write transfers, but for read transfers it
requires that the SD card support Read Wait. Therefore the Host Driver
shall not set this bit during read transfers unless the SD card supports
Read Wait and has set
Read Wait Control
to 1. In the case of write
transfers in which the Host Driver writes data to the
Buffer Data Port
register, the Host Driver shall set this bit after all block data is written. If
this bit is set to 1, the Host Driver shall not write data to
Buffer Data Port
register.
This bit affects
Read Transfer Active
,
Write Transfer Active
,
DAT
Line Active
and
Command Inhibit (DAT)
in the
Present State
register.
Regarding detailed control of bits D01 and D00. (RW)
‘1’ = Stop
‘0’ = Transfer
There are three cases to restart the transfer after stop at the block gap. Which case is appropriate depends on
whether the Host Controller issues a Suspend command or the SD card accepts the Suspend command.
(1) If the Host Driver does not issue a Suspend command, the
Continue Request
shall be used to restart the
transfer.
(2) If the Host Driver issues a Suspend command and the SD card accepts it, a Resume command shall be used
to restart the transfer.
(3) If the Host Driver issues a Suspend command and the SD card does not accept it, the
Continue Request
shall be used to restart the transfer.
Any time
Stop At Block Gap Request
stops the data transfer, the Host Driver shall wait for
Transfer Complete
(in the
Normal Interrupt Status
register) before attempting to restart the transfer. When restarting the data transfer
by
Continue Request
, the Host Driver shall clear
Stop At Block Gap Request
before or simultaneously.
NOTE:
After setting
Stop at Block Gap Request
field, which should not be cleared unless Block Gap Event or Transfer
Complete interrupt occurs. Otherwise, the module hangs.
Summary of Contents for S3C2416
Page 122: ...BUS MATRIX EBI S3C2416X RISC MICROPROCESSOR 3 4 NOTES ...
Page 204: ...DMA CONTROLLER S3C2416X RISC MICROPROCESSOR 8 18 NOTES ...
Page 284: ...WATCHDOG TIMER S3C2416X RISC MICROPROCESSOR 11 6 NOTES ...
Page 320: ...REAL TIME CLOCK S3C2416X RISC MICROPROCESSOR 13 16 NOTES ...
Page 344: ...UART S3C2416X RISC MICROPROCESSOR 14 24 NOTES ...
Page 380: ...USB2 0 DEVICE S3C2416X RISC MICROPROCESSOR 16 34 NOTES ...
Page 432: ...2D S3C2416X RISC MICROPROCESSOR 18 38 NOTES ...
Page 446: ...HS_SPI CONTROLLER S3C2416X RISC MICROPROCESSOR 19 14 NOTES ...
Page 604: ...S3C2416X RISC MICROPROCESSOR S3C2416X RISC MICROPROCESSOR 23 22 NOTES ...
Page 638: ...PCM AUDIO INTERFACE S3C2416X RISC MICROPROCESSOR 25 18 NOTES ...
Page 670: ...ELECTRICAL DATA S3C2416X RISC MICROPROCESSOR 26 32 NOTES ...