VSC7511 datasheet(140/324 Pages) MICROSEMI

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Functional Descriptions

VMDS-10488 VSC7511 Datasheet Revision 4.2

125

3.11.5

Watermark Programming and Consumption Monitoring

The watermarks previously described are all found in the SYS::RES_CFG register. The register is

replicated 1024 times. The following illustration the organization.

Figure 38 •

Watermark Layout

The illustration shows the watermarks available for the BUF_xxx_I group of watermarks. For the other

groups of watermarks (BUF_xxx_I, REF_xxx_I, BUF_xxx_E, and REF_xxx_E), the exact same set of

watermarks are available.

For monitoring the consumption of resources, SYS::RES_STAT provides information about current use

and the maximum use since the last read of the register. The information is available for each of the

watermarks listed and the layout of the RES_STAT register follows the layout of the watermarks.

SYS::MMGT.FREECNT holds the amount of free memory in the shared queue system and

SYS::EQ_CTRL.FP_FREE_CNT holds the number of free frame references in the shared queue system.

REF_COL_SHR_E

REF_COL_SHR_I

Maximum

Effectively disables frame coloring as watermark is never

reached.

REF_PRIO_SHR_E

REF_PRIO_SHR_I

1350 - 1700

The different QoS classes are cut-off with a distance of

50 frame references (1350, 1400, 1450, 1500, 1550, 1600,

1650, and 1700). This gives frames with higher QoS

classes a larger part of the shared reference area.

Table 98 •

Watermark Configuration Example (continued)

Watermark

Value

Comment

BUF_xxx_I

REF_xxx_I

BUF_xxx_E

REF_xxx_E

Port and QoS class

reservation

watermarks

(xxx = Q_RSRV)

Port reservation

watermarks

(xxx = P_RSRV)

Color Sharing

watermarks

(xxx = COL_SHR)

Port 0

Port 1

Port 2

Port 10

Port 11

...

QoS class 0

QoS class 1

QoS class 2

QoS class 6

QoS class 7

QoS class sharing

watermarks

(xxx = PRIO_SHR)

Port 0

Port 1

Port 2

Port 10

Port 11

...

DP 1 (yellow)

DP 0 (green)

QoS class 3

QoS class 4

QoS class 5

216

224

254

256

512

768

QoS class 0

QoS class 1

QoS class 2

QoS class 6

QoS class 7

QoS class 3

QoS class 4

QoS class 5

VSC7511 Datasheet(PDF) 140 Page - Microsemi Corporation

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