le79128 Zarlink Semiconductor, le79128 Datasheet - Page 19

• Manufacturer Part Number: le79128
• Description: Next Generation Voiceedge™ Control Processor Next Generation Carrier Chipset Ngcc
• Manufacturer: Zarlink Semiconductor

Page Offset (PGOFFSET)
Page Offset contains a pointer to the address of the next transaction into the current mailbox. This
register allows interleaved access to a given page. To implement interleaved access, the host must
read this register prior to changing the active page. After restoring the active page the host must
restore the Page Offset to continue accesses from the previous position with a Continue Page
access command. Alternatively, a paged offset access may be used, immediately.
PG_OFFSET[9:0]
Mailbox Flag (MBFLAG)
This register indicates access rights to the VCP device’s command and response mailboxes
corresponding to page 0 and 1 respectively. The VCP device transfers mailbox control to the host
by writing a 0 to the respective bit indicating that the host has access to the corresponding mailbox.
The host transfers mailbox control to the VCP device by writing a 1 to the bit which corresponds to
the mailbox to which the host is relinquishing control. Note that the host and the VCP device can
only relinquish control of a mailbox. Neither can request control and it is therefore important that
both relinquish control in a reasonably expedient manner.
CMD_FLAG
RSP_FLAG
Page 255 Checksum High Register
RSVD
RSVD
D15
D15
D15
D7
D7
D7
RSVD
RSVD
D14
D14
D14
D6
D6
D6
Address offset of the next access to the currently selected mailbox.
The host sets the Command Mailbox flag by writing a 1 to the associated
bit. Writing a 0 to any bit has no affect.
0: Host owns associated mailbox.
1: DSP owns associated mailbox.
The host sets the Response Mailbox flag by writing a 1 to the associated
bit. Writing a 0 to any bit has no affect.
0: Host owns associated mailbox.
1: DSP owns associated mailbox.
RSVD
RSVD
Microsemi Corporation - CMPG
D13
D13
D13
D5
D5
D5
RSVD
Le79128
19
RSVD
RSVD
D12
D12
D12
D4
D4
D4
PG_OFFSET[7:0]
CHKSUM[31:24]
CHKSUM[23:16]
RSVD
RSVD
D11
D11
D11
D3
D3
D3
Direct page address 0x02 (RW)
Direct page address 0x03 (RW)
RSVD
RSVD
D10
D10
D10
Direct page address 0x04 (RW
D2
D2
D2
Preliminary Data Sheet
RSP_FLAG
RSVD
D9
D1
D9
D1
D9
D1
PG_OFFSET[9:8]
CMD_FLG
RSVD
D8
D0
D8
D0
D8
D0