Publication No. PPC11A-HRM/1
Control and Status Registers 77
5.13
NOR Flash Page Register (Offset 0x636)
Bits
Description
Default
7
Flash paging enable:
1 = Enabled
0 = Disabled
1
6 to 1
Reserved
000000
b
0
Flash page selected:
1 = Page 1
0 = Page 0
1
5.14
AXIS Registers
5.14.1 AXIS Timestamp Registers 0 to 5
These can be used to read the 48-bit timestamp. Reading register 0 latches the
current timestamp value into registers 1 to 5, so register 0 must always be read first.
AXIS Timestamp Register Offset Timestamp Value Bits
Default
0
0x648 7 to 0 (least significant byte)
0x00
1
0x649 15 to 8
0x00
2
0x64A 23 to 16
0x00
3
0x64B 31 to 24
0x00
4
0x64C 39 to 32
0x00
5
0x64D 47 to 40 (most significant byte) 0x00
5.14.2 AXIS Clock Frequency Register (Offset 0x64E)
This returns the AXIS master clock period in nanoseconds. When the PPC11A is
clock master, the frequency is 25 MHz (40 ns).
NOTE
Do not use this register when the PPC11A is an AXIS clock slave, as the frequency cannot be determined.
Software may use this register to determine if the AXIS timer is implemented (it
returns 0x00 if there is no AXIS timer).