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Cryptography Registers

10.2.1.14 KEYSIZE Register (Offset = 408h) [reset = X]

KEYSIZE is shown in Figure 10-16 and described in Table 10-24.

Key Size This register defines the size of the keys that are written with DMA.

Figure 10-16. KEYSIZE Register

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16

RESERVED

R/W-X

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

RESERVED SIZE

R/W-X R/W-1h

Table 10-24. KEYSIZE Register Field Descriptions

Bit Field Type Reset Description

31-2 RESERVED R/W X

Software should not rely on the value of a reserved. Writing any

other value than the reset value may result in undefined behavior.

1-0 SIZE R/W 1h

Key size When writing to this register, KEYWRITTENAREA will be

reset. Note: For the Crypto peripheral this field is fixed to 128 bits.

For software compatibility KEYWRITTENAREA will be reset when

writing to this register.

1h = 128_BIT : 128 bits

2h = 192_BIT : Not supported

3h = 256_BIT : Not supported

839

SWCU117A–February 2015–Revised March 2015

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