8101 datasheet(32/172 Pages) LSI

32 / 172 page

2-14

Functional Description

RXABORT deﬁnition bit in “Register 9–Conﬁguration 3‚" Section 4.3.10,

also programs the controller to discard either the data packet and its

status word or just the data packet exclusive of the status word.

The RXOEn signal, when asserted, places certain receive outputs in the

high-impedance state. RXOEn affects the RXD[31:0], RXBE[3:0],

RXSOF, and RXEOF output pins.

2.6.4 Bus Width

Setting the BUSSIZE bit in “Register 10–Conﬁguration 4‚" Section 4.3.11,

changes the receive word width from 32-bits to 16-bits. When the bus

width is conﬁgured to 16-bits, the receive system interface data outputs

appear on RXD[15:0] and the data words are now 16-bits wide instead

of 32-bits wide.

Note:

The transmit word width can be adjusted by appropriately

setting the transmit byte enable inputs, TXBE[3:0], as

described in Table 2.2.

2.6.5 System Interface Disable

To disable the system interface, set the SINTF_DIS bit in “Register 9–

Conﬁguration 3‚" Section 4.3.10. When the system interface is disabled,

the controller:

• Places all system interface outputs in the high-impedance state

(TXWMn[1:2], TXDC, RXD[31:0], RXBE[3:0], RXSOF, RXEOF,

RXWM1/2, RXDC)

• Ignores all inputs (SCLK, TXENn, TXD[31:0], TXBE[3:0], TXSOF,

TXEOF, CLR_TXDC, FCNTRL, TXCRCn, RXENn, RXOEn,

CLR_RXDC, RXABORT)

• Transmits /C/ (see Table 2.8) ordered sets with the remote fault bits

RF[1:0] = 0b10 over the 10-bit PHY interface outputs

8101 Datasheet(PDF) 32 Page - LSI Computer Systems