PM5380-BI PMC-Sierra, Inc., PM5380-BI Datasheet - Page 332

• Manufacturer Part Number: PM5380-BI
• Description: Network Interface, SATURN User Network Interface (8x155) Telecom Standard Product
• Manufacturer: PMC-Sierra, Inc.

Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC- 2010299, Issue 2
Register 0x1026: RUL3 POS Level 3 Transfer Size
TRAN[5:0]:
The TRAN[5:0] bits determine the maximum transfer length the POS-PHY Level 3
interface will service a PHY channel before servicing another PHY channel. TRAN[5:0]
specifies the maximum number, plus 1, of RFCLK clock cycles the POS-PHY Level 3
interface will service on PHY channel. Therefore, the maximum number of bytes per
transfer is 4*(TRAN[5:0]+1).
The actual transfer burst length is until an end-of-packet is transferred or until the burst
length specified by TRAN[5:0]. Valid transfer burst length range from 1 to 63.
TRAN[5:0] and BURST[6:0] must be configured such that the sum of TRAN[5:0] in
number of bytes and RUL3 BURST[6:0] in number of byte should be less than the 256
bytes (the size of the channel FIFO). Last DWORD of an ATM cell is trapped in RUL3
FIFO for 52 bytes cell structure, if RUL3 TRAN is set to 4 , 8, 12, 16 or 24 bytes. For 56
bytes cell structure, the last DWORD of ATM cell will be trapped if RUL3 TRAN is set to 4
bytes.
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Type
R
R
R/W
R/W
R/W
R/W
R/W
R/W
Function
Unused
Unused
TRAN[5]
TRAN[4]
TRAN[3]
TRAN[2]
TRAN[1]
TRAN[0]
S/UNI®-8x155 ASSP Telecom Standard Product Data Sheet
Default
X
X
0
0
1
1
1
0
Released
332