CN8237EBGB Mindspeed Technologies, CN8237EBGB Datasheet - Page 207

• Manufacturer Part Number: CN8237EBGB
• Description: ATM SAR 622Mbps 3.3V ABR/CBR/GFR/UBR/VBR 456-Pin BGA
• Manufacturer: Mindspeed Technologies

Specifications of CN8237EBGB

• Package: 456BGA
• Traffic Class: ABR|CBR|GFR|UBR|VBR
• Utopia Type: Level 1|Level 2
• Host Interface: PCI
• Maximum Data Rate: 622 Mbps
• Typical Operating Supply Voltage: 3.3 V
• Minimum Operating Supply Voltage: 3.135 V

CN8237
ATM OC-12 ServiceSAR Plus with xBR Traffic Management
28237-DSH-001-C
Table 6-21. ABR SCH_STATE Field Descriptions (1 of 2)
L_EXP
L_MAN
I_EXP
I_MAN
PRESENT
MCR_LIM_NZ
DELTA_SIGN
DELTA_NZ
MCR_LIM_EXP
MCR_LIM_MAN
DELTA_EXP
DELTA_MAN
EN_SRC_NCR
S_NCR_TRIG
S_NCR_DIR
OOR_PRI
DCR_STAT
TM_EXP
BCK_OOR
FWD_OOR
SCH_OOR
TA_XMIT
TA_PND
CELL_INDEX
FWD_INDEX
RM_TIME
Field Name
GCRA L parameter exponent for ER rate.
GCRA L parameter mantissa for ER rate.
GCRA I parameter exponent for ER rate.
GCRA I parameter mantissa for ER rate.
Current Schedule table position.
MCR Limit is non-0.
must be set to 1.
Delta is non-0 for ER rate.
MCR Limit exponent.
MCR_LIM_EXP must satisfy MCR_LIM_EXP 29.
must be set to a decimal value of 31 (that is, binary all-1s).
MCR Limit mantissa.
MCR_LIMIT is
This format for calculating MCR_LIMIT is the same as used with the GCRA I parameter to calculate rates.
VCC priority is increased by 1 when rate falls below 1 / MCR_LIM.
must be set to a decimal value of 511 (that is, binary all-1s).
Delta exponent for ER rate.
Delta mantissa for ER rate.
Desired position for ER rate is
Enable source ACR change notification processing.
Indicate direction of source ACR trigger. 1 for HI, 1 for low.
Segmentation priority for out-of-rate RM cells.
Destination ACR change status to be sent. Initialize to logic low.
RM_TIME value has expired and is no longer valid.
Backward RM cell has been scheduled out-of-rate.
Forward RM cell has been scheduled out-of-rate.
A Backward RM cell has been transmitted after the last Forward RM cell transmitted.
A Backward RM cell is waiting for transmission.
ER cell type decision block index for cell type decisions. The cell type decision block is located at byte
address SCH_ABRB × 128 + 8 × CELL_INDEX.
ER cell type decision block index for cell type decisions after a Forward RM cell is transmitted.
Global slot count [21:6] at time of last Forward RM transmission.
Delta is negative for ER rate.
Source ACR change has been triggered. Initialize to logic flow.
VCC has halted due to low ACR and has out-of-rate Forward RM cells enabled.
To disable priority bumping, MCR_LIMIT must be set to its maximum value. Thus, MCR_LIM_NZ
To disable priority bumping, MCR_LIMIT must be set to its maximum value. Thus, MCR_LIM_EXP
MCR_LIM_NZ × 2
To disable priority bumping, MCR_LIMIT must be set to its maximum value. Thus, MCR_LIM_MAN
DELTA_NZ × 2
(DELTA_EXP–10)
Mindspeed Technologies
(MCR_LIM_EXP–10)
(1+DELTA_MAN / 512) + PRESENT
(1 + MCR_LIM_MAN / 512)
Description
6.5 Traffic Management Control and Status Structures
™
6.0 Traffic Management
6-51