Intel E3815 FH8065301567411 Data Sheet

 

Intel

®

 Atom™ Processor E3800 Product Family

Datasheet

1879

This register contains the SD Command Argument.

Default: 00000000h

This register is used to control the operation of data transfers. The Host Driver shall set 

this register before issuing a command which transfers data (Refer to Data Present 

Select in the Command register), or before issuing a Resume command. The Host 

Driver shall save the value of this register when the data transfer is suspended (as a 

result of a Suspend command) and restore it before issuing a Resume command. To 

prevent data loss, the Host Controller shall implement write protection for this register 

during data transactions. Writes to this register shall be ignored when the Command 

Inhibit (DAT) in the Present State register is 1.

15:0

0000h

RW

This register is enabled when Block 

Count Enable in the Transfer Mode register is set to 1, and is valid only for multiple block 

transfers. The Host Driver shall set this register to a value between 1 and the maximum 

block count. The HC decrements the block count after each block transfer, and stops 

when the count reaches zero. Setting the block count to 0 results in no data blocks 

being transferred. This register should be accessed only when no transaction is 

executing (i.e., after transactions are stopped). During data transfer, read operations on 

this register may return an invalid value and write operations are ignored. When saving 

transfer context as a result of a Suspend command, the number of blocks yet to be 

transferred can be determined by reading this register. When restoring transfer context 

prior to issuing a Resume command, the HD shall restore the previously saved block 

count. 
•

0000h = Stop Count 

•

0001h = 1 block 

•

0002h = 2 blocks 

•

.  .  . 

•

FFFFh = 65535 blocks 

Memory Mapped I/O Register

(Size: 32 bits)

PCI Configuration Register (Size: 32 bits)

[B:0, D:23, F:0] + 10h

31

28

24

20

16

12

8

4

0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

ar

gument

31:0

0h

RW

The SD Command Argument is specified as 

bit39-8 of Command-Format in the Physical Layer Specification.