PDP83TG720SWCSTQ1 datasheet(28/199 Pages) TI

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7.3.1.3.3 Programming Datapath BIST

Following register settings enable different loopbacks, data genaration and data checker procedures :

Table 7-2. Datapath BIST Programming

Loopback

Mode

To enable

loopback

mode

To enable data

generator and

checker : MAC

packets

To check in-

coming MAC

packets status

To enable data

generator and

checker :

PRBS stream

To check in-

coming PRBS

status : PRBS

stream

Other care-

abouts

Analog

loopback

•

write :

reg[0x0016

]=0x0008

•

write:

reg[0x0405

]=0x2800

•

write :

reg[0x0619

]=0x1555

•

write :

reg[0x0624

]=0x55BF

•

read :

reg[0x063C]

for (15:0) of

total

received

packets

count.

•

read :

reg[0x063D]

for (31:16)

of total

received

packets

count.

•

read :

reg[0x063E]

for Packets

received

with CRC

errors

•

write :

reg[0x0619

]=0x0557

•

write :

reg[0x0624

]=0x55BF

Step 1 : write :

reg[0x0620](1)

= 1'b1

Step 2 :

•

read :

reg[0x0620]

(7:0) =

Number of

error bytes

received.

•

read :

reg[0x0620]

(8) (1

indicates

PRBS data

is coming in

and checker

is locked)

•

Disconnect

the cable/

link-partner.

•

Generated

data will be

going to

MAC side,

to disable

MAC side :

write

reg[0x0000

]=0x0540

Digital loopback •

write :

reg[0x0016]

= 0x0004

•

write :

reg[0x0619

]=0x1555

•

write :

reg[0x0624

]=0x55BF

•

read :

reg[0x063C]

= [15:0] of

total

received

packets

count.

•

read :

reg[0x063D

]= [31:16] of

total

received

packets

count.

•

read :

reg<0x063E

> ->

Packets

received

with CRC

errors

•

write :

reg[0x0619

]=0x0557

•

write :

reg[0x0624

]=0x55BF

Step 1 : write :

reg[0x0620][1]

= 1'b1

Step 2 :

•

read :

reg[0x0620]

[7:0] =

Number of

error bytes

received.

•

read :

reg[0x0620]

[8] (1

indicates

PRBS data

is coming in

and checker

is locked)

•

Generated

data will be

going to Cu

cable side,

to disable

this

transmissio

n : write

reg[0x041F]

= 0x1000

•

Generated

data will be

going to

MAC side,

to disable

MAC side :

write

reg[0x0000

]=0x0540

DP83TG720S-Q1

SNLS604 – SEPTEMBER 2020

www.ti.com

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