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MOTOROLA Chapter 6. Programming Model 6-7
PRELIMINARYÑSUBJECT TO CHANGE WITHOUT NOTICE
Table 6-8 describes R_BUFF_SIZE Þelds.
6.2.8 Ethernet Control Register (ECNTRL)
The Ethernet control register (ECNTRL), shown in Figure 6-8, is used to enable and disable
the FEC. It is written by the user and cleared at system reset.
Bits 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Field Ñ
Reset UndeÞned
R/W Read/write
Addr 0xE18
Bits 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Field Ñ R_BUFF_SIZE Ñ
Reset UndeÞned
R/W Read/write
Addr 0xE1A
Figure 6-7. R_BUFF_SIZE Register
Table 6-8. R_BUFF_SIZE Field Descriptions
Bits Name Description
0Ð20 Ñ Reserved. Should be written to zero by the host processor.
21Ð27 R_BUFF_SIZE Receive buffer size.
28Ð31 Ñ Reserved. Should be written to zero by the host processor.
Bits 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Field Ñ
Reset 0000_0000_0000_0000
R/W Read/write
Addr 0xE40
Bits 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Field SPARE FEC_PIN
MUX
ETHER_EN RESET
Reset 0000_0000_0000_0000
R/W Read/write
Addr 0xE42
Figure 6-8. ECNTRL Register
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eescale S
emiconduct
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Freescale Semiconductor, Inc.
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