Samsung S5PC100, User Manual

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S5PC100 USER’S MANUAL (REV1.0) CRYPTO ENGINE BLOCK
11.3-7
3 PROGRAMMER’S MODEL
This Programmer’s model describes ACE(SECSS) operation sequences for programmer. The ACE has three
operation mode : CPU mode, FIFO mode, and DMA mode. For correct each mode operation, the ACE must be
configured and started according to the following sequences. Followings are ACE’s SFR(Special Function
Register) configuration and operation sequence to the each mode.
3.1 CPU MODE
①
Sets Control Registers of the crypto engine
②
Write Data to Data Input Registers : Repeat following step from step d to step f as needed
③
Starts crypto engine
④
Read Data form Data Output Register
3.2 FIFO MODE
①
Sets Control Registers of the crypto engine
②
Sets Control Register of Rx/Tx FIFO
③
Start Rx/Tx FIFO
④
Write Data to Rx FIFO
⑤
Polls Tx FIFO Transfer Done
⑥
Read Data from Tx FIFO
3.3 DMA MODE
①
Sets Control Registers of crypto engine
②
Sets DMA and Interrupt control register of the ACE
③
Sets Control Register of Rx/Tx FIFO
④
Start Rx/Tx FIFO
⑤
Write Data to Memory
⑥
DMA Rx Channel Start : Write Data to Rx FIFO
⑦
DMA Tx Channel Start : Read Data from Tx FIFO
⑧
Polls Tx DMA Operation Done
⑨
Polls Tx FIFO Transfer Done
3.4 CHANGE MODE FROM FIFO MODE TO DMA MODE
When programmers change ACE operation mode from FIFO mode to DMA mode, the first ACE Tx FIFO DMA
request must be cleared by executing DMA ACK instruction(DMAFLUSHP P1)
①
FIFO Mode Operation Done
②
Clear Tx FIFO DMA Request
③
Sets Control Registers of crypto engine
④
Sets DMA and Interrupt control register of the ACE
⑤
Sets Control Register of Rx/Tx FIFO
⑥
Start Rx/Tx FIFO
⑦
Write Data to Memory
⑧
DMA Rx Channel Start : Write Data to Rx FIFO
⑨
DMA Tx Channel Start : Read Data from Tx FIFO
⑩
Polls Tx DMA Operation Done