TSB12C01APZ datasheet(38/59 Pages) TI

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4–8

Table 4–9. Phy Configuration Functions

FIELD NAME

DESCRIPTION

This field is the phy configuration packet identifier.

root_ID

This field is the physical_ID of the node to have its force_root bit set (only meaningful when

R is set).

R†

When R is set, the force-root bit of the node identified in root_ID is set and the force_root bit

of all other nodes are cleared. When R is cleared, root_ID is ignored.

T†

When T is set, the PHY_CONFIGURATION.gap_count field of all the nodes is set to the value

in the gap_cnt field.

gap_cnt

This field contains the new value for PHY_CONFIGURATION.gap_count for all nodes. This

value goes into effect immediately upon receipt and remains valid after the next bus reset.

After the second reset, gap_cnt is set to 63h unless a new phy configuration packet is

received.

† A phy configuration packet with R = 0, and T = 0 is reserved and is ignored when received.

4.7

Link-On

The format of the link-on packet is shown in Figure 4–10. The link-on packet transmit contains two quadlets,

which are loaded into the ATF. The first quadlet is written to address 80h. The second quadlet is written to

address 8Ch. The 00E0h in the first quadlet tells the TSB12C01A that this is the link-on packet. The Eh is

then replaced with 0h before the packet is transmitted to the phy interface.

1 2 3

5 6 7

9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

logical inverse of first 16 bits of first quadlet

root_ID

00 00

11 11

00 0

Figure 4–10. Link-On Format

Table 4–10. Link-On Functions

FIELD NAME

DESCRIPTION

This field is the link-on packet identifier.

root_ID

This field is the physical_ID of the node to have its force_root bit set.

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