PXD20RM Datasheet, PDF (1163/1628 Pages) Freescale Semiconductor, Inc – PXD20 Microcontroller

31.4.56 VGV3_WRITE
Offset: 0x73
Access: User write
Field
31–0
Reset
Description
0x0
Write this value to VGV3_WRITEADDR. This can be used to report to the CPU how far in the stream
reading has progressed
31.4.57 VGV3_WRITEIFPAUSED
Offset: 0x74
Access: User write
Field
31–0
Reset
Description
Write this value to VGV3_WRITEADDR if reading is paused. This should be the last register write in a
0x0
packet so that pause/mark counter state has been updated for the packet before the write condition com-
pare happens. Every marked packet should probably have this conditional write so that the CPU can
detect when a pause request has been completed.
31.4.58 VGV3_NEXTADDR
Offset: 0x75
Field
31–0
Reset
Description
0x0 Address of sub-stream packet to call (see VGV3_NEXTCMD register)
Access: User write
31.4.59 VGV3_NEXTCMD
Offset: 0x76
Access: User write
Field Reset
Description
31–28
27–16
15
14–12
11–0
0x0 Reserved
0x0 CALLCOUNT. Length of sub-stream packet in call in dwords.
0x0
MARK. If set: mark counter is decreased by one when this packet ends. If it becomes zero reading is
paused.
NEXTCMD. Action to perform after this packet.
0x0 Continue reading at current address, COUNT gives size of next packet.
0x1 Jump to CALLADDR, COUNT gives size of next packet.
0x0
0x2 First call a sub-stream at CALLADDR for CALLCOUNT dwords. Then perform a continue.
0x3 Not supported.
0x4 Not supported.
0x5 Abort reading. This ends the stream. Normally stream can just be paused (or automatically pauses
at the end) which avoids any data being lost.
0x0 COUNT. Length of next packet in dwords.
Freescale Semiconductor
PXD20 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
31-31