55.5.10 SHA Input/Output Data Register x

Name:	SHA_IODATARx
Offset:	0x80 + x*0x04 [x=0..15]
Reset:	0x00000000
Property:	Read/Write


Bit	31	30	29	28	27	26	25	24
	IODATA[31:24]
Access	R/W	R/W	R/W	R/W	R/W	R/W	R/W	R/W
Reset	0	0	0	0	0	0	0	0


Bit	23	22	21	20	19	18	17	16
	IODATA[23:16]
Access	R/W	R/W	R/W	R/W	R/W	R/W	R/W	R/W
Reset	0	0	0	0	0	0	0	0


Bit	15	14	13	12	11	10	9	8
	IODATA[15:8]
Access	R/W	R/W	R/W	R/W	R/W	R/W	R/W	R/W
Reset	0	0	0	0	0	0	0	0


Bit	7	6	5	4	3	2	1	0
	IODATA[7:0]
Access	R/W	R/W	R/W	R/W	R/W	R/W	R/W	R/W
Reset	0	0	0	0	0	0	0	0

Bits 31:0 – IODATA[31:0] Input/Output Data

These registers can be used to read the resulting message digest and to write the second part of the message block when the SHA algorithm is SHA-384 or SHA-512.

SHA_IODATAR0 to SHA_IODATAR15 can be written or read but reading these offsets does not return the content of corresponding parts (words) of the message block. Only results from SHA calculation can be read through these registers.

When SHA processing is in progress, these registers return 0x0000.

SHA_IODATAR0 corresponds to the first word of the message digest; SHA_IODATAR4 to the last one in SHA1 mode, SHA_IODATAR6 in SHA224, SHA_IODATAR7 in SHA256, SHA_IODATAR11 in SHA384 or SHA_IODATAR15 in SHA512.

When SHA224 is selected, the content of SHA_IODATAR7 must be ignored.

When SHA384 is selected, the content of SHA_IODATAR12 to SHA_IODATAR15 must be ignored.