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PDP83TG720SWCSTQ1 Datasheet(PDF) 29 Page - Texas Instruments |
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PDP83TG720SWCSTQ1 Datasheet(HTML) 29 Page - Texas Instruments |
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29 / 199 page  Table 7-2. Datapath BIST Programming (continued) 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 3 PCS loopback • write : reg<0x0016 > = 0x0001 • 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 4 RGMII loopback • write : reg<0x0000 > = 0x4140 • Data is generated externally at Rgmii TX pins • Write : reg[0x0619 ]= 0x1004 • Data can be verified at Rgmii RX pins. • Packet errors can additionaly be checked internally by : – read : reg[0x0 63C]= [15:0] of total receive d packets count. – read : reg[0x0 63D] = [31:16] of total receive d packets count. – read : reg[0x0 63E]= Packets receive d with CRC errors • Data is generated externally at Rgmii Tx pins. • Not applicable as data is external. • PRBS stream checker works only with internal data generator. • Generated data will be going to Cu cable side, to disable this transmissio n : write reg[0x041F] = 0x1000 www.ti.com DP83TG720S-Q1 SNLS604 – SEPTEMBER 2020 Copyright © 2020 Texas Instruments Incorporated Submit Document Feedback 29 |
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