le79128 Zarlink Semiconductor, le79128 Datasheet - Page 15

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

Command Structure
All transport frames start with a 16-bit command word followed by 0 or more 16-bit data words. The same command format is
used for both the GPI and the SPI.
command.
Paged Offset Access
This command accesses one or more contiguous 16-bit registers on the currently selected page. The 7-bit
offset specifies the starting address on the page. The command is followed by (Length + 1) 16-bit data words.
The 7-bit Length field allows accessing between 1 and 128 locations with a single transport frame. For nonzero
Lengths, the address automatically increments, and consecutive locations are accessed.
Direct Offset Access
Direct Offset Access is the same as Paged Offset Access, except that the direct page is the target. By using
this command, the direct page can be accessed at any time without modifying the page register.
Start Paged Access
This command accesses a contiguous stream of 16-bit data words starting from offset 0 on the currently
selected page. The command is followed by (Length + 1) 16-bit data words. The 8-bit Length field allows
accessing between 1 and 256 locations (i.e. up to 512 bytes) with a single transport frame. Access always
begins from offset 0, and the address automatically increments.
Continue Paged Access
Continue Paged Access is the same as the Start Paged Access, except that access starts from where the last
paged access left off. By using this command, packets of arbitrary length can be supported. This gives the host
the flexibility to split packets transfer into smaller sizes if desired.
Continue Paged Access
Transport Command
Paged Offset Access
Direct Offset Access
Start Paged Access
Configure Interface
a. Read/Write select bit. 0 = Read. 1 = Write.
b. Addresses 120 - 127 on the Direct Page are reserved.
Select Page
Table 9. Host Bus Interface Transport Commands
NOP
r/w
r/w
15
7
0
1
1
1
1
1
1
1
a.
a
Table 9
14
6
1
1
1
1
1
1
13
provides a list of transport commands followed by a short description of each
5
1
1
1
1
1
1
Command Bit Position
Page Number (0 - 255)
Interface Option Bits
Microsemi Corporation - CMPG
Offset Address
Offset Address (0 - 127)
Length (0 - 255)
Length (0 - 255)
12
4
1
1
1
1
1
1
Length
Length (0 - 127)
Le79128
b.
11
15
3
1
1
1
1
1
1
(0 - 119)
b
(0 - 119)
10
2
0
0
1
1
1
1
9
1
0
1
0
1
1
1
r/w
r/w
8
0
1
0
1
1
a.
a.
Data Words
Number of
Length + 1
Length + 1
Length + 1
Length + 1
Preliminary Data Sheet
16-bit
0
0
0