VSC8221 datasheet(106/138 Pages) MICROSEMI

106 / 138 page

VSC8221

Data Sheet

VMDS-10106 Revision 4.1

December 2006

106 of 106

106

29E.9:6 - Destination Address

The 6-byte destination address for packets generated by the EPG is assigned one of 16 values in the range 0xF0 FF FF FF FF

FFh through 0xFF FF FF FF FF FFh. The most significant byte’s lower nibble bits of the destination address are selected by bits

29E.9:6. if bits 29E.9:6 change during packet transmission, the new values will not take effect until the EPG Run/Stop bit

(29E.14) has been cleared and set to a “1” again.

29E.5:2 - Source Address

The 6-byte source address for packets generated by the EPG is assigned one of 16 values in the range 0xF0 FF FF FF FF FFh

through 0xFF FF FF FF FF FFh. The most significant byte’s lower nibble bits of the source address are selected by bits 29E.5:2.

if bits 29E.5:2 change during packet transmission, the new values will not take effect until the EPG Run/Stop bit (29E.14) has

been cleared and set to a “1” again.

29E.1 - TXER Control

When bit 29E.1 is set to a “1”, all packets generated by the EPG will have the TXER signal asserted. When this bit is cleared,

TXER is not asserted. if bit 29E.1 changes during packet transmission, the new value will not take effect until the EPG Run/Stop

bit (29E.14) has been cleared and set to a “1” again.

29E.0 - Bad FCS Generation

When bit 29E.0 is set to a “1”, the EPG will generate packets containing an invalid Frame Check Sequence (FCS). When this bit

is cleared, the all EPG packets will contain a valid Frame Check Sequence. if bit 29E.0 changes during packet transmission, the

new value will not take effect until the EPG Run/Stop bit (29E.14) has been cleared and set to a “1” again.

23.3.15 Register 30E (1Eh) - 1000BASE-T Ethernet Packet Generator Register #2

30E.15:0 - EPG Packet Payload

Each packet generated by the EPG contains a repeating sequence of bits 30E.15:0 as the data payload. if bits 30E.15:0 change

during packet transmission, the new values will not take effect until the EPG Run/Stop bit (29E.14) has been cleared and set to

a “1” again.

1 Refer to Section 17.1 on page 51 for more information.

Bit

Name

Access

States

Reset Value

Sticky

15:0

EPG Packet Payload

R/W

Data for packets generated by EPG 00000000 00000000

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