24.7.1 Write Control


Bit	31	30	29	28	27	26	25	24

Access
Reset


Bit	23	22	21	20	19	18	17	16
	KEY[7:0]
Access	RW	RW	RW	RW	RW	RW	RW	RW
Reset	0	0	0	0	0	0	0	0


Bit	15	14	13	12	11	10	9	8
	PERID[15:8]
Access	RW	RW	RW	RW	RW	RW	RW	RW
Reset	0	0	0	0	0	0	0	0


Bit	7	6	5	4	3	2	1	0
	PERID[7:0]
Access	RW	RW	RW	RW	RW	RW	RW	RW
Reset	0	0	0	0	0	0	0	0

Bits 23:16 – KEY[7:0] Peripheral Access Control Key

These bits define the peripheral access control key:

Value	Name	Description
0x0	OFF	No action
0x1	CLEAR	Clear the peripheral write control
0x2	SET	Set the peripheral write control
0x3	LOCK	Set and lock the peripheral write control until the next hardware reset

Bits 15:0 – PERID[15:0] Peripheral Identifier

The PERID represents the peripheral whose control is changed using the WRCTRL.KEY. Formula to calculate the peripheral identifier:

P E R I D = 32 * BridgeNumber + N

Where, BridgeNumber represents the Peripheral Bridge Number (0 for Peripheral Bridge A, 1 for Peripheral Bridge B, etc). N represents the peripheral index from the respective Bridge Number. For example, PAC peripheral belongs to Peripheral Bridge A at the ‘0’ bit position (see INTFLAGA from Related Links). Therefore, PERID = 32*0+0 = 0 for PAC peripheral.

Table 24-2. PERID Values
Peripheral Bridge Name	BridgeNumber	PERID Values
A	0	0+N
B	1	32+N
C	2	64+N

Name:	WRCTRL
Offset:	0x00
Reset:	0x00000000
Property:	–