PM8621 PMC-Sierra, Inc., PM8621 Datasheet - Page 146

• Manufacturer Part Number: PM8621
• Description: NSE-8G Standard Product Data Sheet Preliminary
• Manufacturer: PMC-Sierra, Inc.

12.6.2
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-2010850, Issue 1
Example: Suppose one wishes to change the cross bar to map DIN[10][12:0] to DOUT[6][12:0]
for just the 4097th byte of the frame and wishes to keep all other mappings of the 4097th byte the
same.
Steps:
1. CPU writes 0x8a061000 to the DCB Access Mode register (i.e., WRB=1, ACCMDE=0,
2. Wait four SYSCLK cycles.
3. Writes 0x0a061000 to the DCB Access Mode register (i.e., WRB=0, ACCMDE=0,
4. Wait four SYSCLK cycles before returning to step 1 to perform another mapping change.
In word transfer mode, the microprocessor updates the entire word of offline connection memory
page. The steps to perform a word transfer is shown in the following example:
Example: Suppose one wishes to change the entire cross bar mapping from DIN to DOUT for just
the 4097th byte of the frame.
Steps:
1. CPU writes new mapping to the Configuration 31-30 Port register.
2. CPU writes new mapping to the Configuration 29-24 Port register.
3. CPU writes new mapping to the Configuration 23-18 Port register.
4. CPU writes new mapping to the Configuration 17-12 Port register.
5. CPU writes new mapping to the Configuration 11-6 Port register.
6. CPU writes new mapping to the Configuration 5-0 Port register .
7. CPU write 0x40001000 to the DCB Access Mode register.
Configuring the DCB using Word transfer mode:
PORTCFG[4:0]=0x0A, PORTADDR[4:0]=0x06, WORDADDR[13:0]=0x1000).
PORTCFG[4:0]=0x0A, PORTADDR[4:0]=0x06, WORDADDR[13:0]=0x1000).
Causes MUX B to switch in PORTCFG at port 6.
Causes MUX C to switch in MUX B.
Triggers a read from offline memory connection page at location 0x1000.
Causes MUX B to switch in PORTCFG at port 6.
Causes MUX C to switch in MUX B.
Triggers a write from register D to offline connection memory page at location 0x1000.
Causes Mux C to switch in WORDCFG.
NSE-8G™ Standard Product Data Sheet
Preliminary
145