
Signal Descriptions
2-14
Freescale Semiconductor
2.3.10
I
2
C I/O Signals
describes the I
2
C serial interface module signals.
Collision
FEC_COL
Asserted upon detection of a collision and remains asserted while the
collision persists. This signal is not defined for full-duplex mode.
I
Carrier Receive Sense
FEC_CRS
When asserted, indicates that transmit or receive medium is not idle.
Applies to MII mode operation.
I
Transmit Clock
FEC_TXCLK
Input clock which provides a timing reference for FEC_TXEN,
FEC_TXD[3:0] and FEC_TXER
I
Transmit Enable
FEC_TXEN
Indicates when valid nibbles are present on the MII. This signal is
asserted with the first nibble of a preamble and is negated before the
first FEC_TXCLK following the final nibble of the frame.
O
Transmit Data 0
FEC_TXD0
FEC_TXD0 is the serial output Ethernet data and is only valid during
the assertion of FEC_TXEN. This signal is used for 10-Mbps Ethernet
data. It is also used for MII mode data in conjunction with
FEC_TXD[3:1].
O
Transmit Data 1–3
FEC_TXD[3:1] In Ethernet mode, these pins contain the serial output Ethernet data
and are valid only during assertion of FEC_TXEN in MII mode.
O
Transmit Error
FEC_TXER
In Ethernet mode, when FEC_TXER is asserted for one or more clock
cycles while FEC_TXEN is also asserted, the PHY sends one or more
illegal symbols. FEC_TXER has no effect at 10 Mbps or when
FEC_TXEN is negated. Applies to MII mode operation.
O
Receive Clock
FEC_RXCLK
Provides a timing reference for FEC_RXDV, FEC_RXD[3:0], and
FEC_RXER.
I
Receive Data Valid
FEC_RXDV
Asserting the FEC_RXDV input indicates that the PHY has valid
nibbles present on the MII. FEC_RXDV should remain asserted from
the first recovered nibble of the frame through to the last nibble.
Assertion of FEC_RXDV must start no later than the SFD and exclude
any EOF.
I
Receive Data 0
FEC_RXD0
FEC_RXD0 is the Ethernet input data transferred from the PHY to the
media-access controller when FEC_RXDV is asserted. This signal is
used for 10-Mbps Ethernet data. This signal is also used for MII mode
Ethernet data in conjunction with FEC_RXD[3:1].
I
Receive Data 1–3
FEC_RXD[3:1] In Ethernet mode, these pins contain the Ethernet input data
transferred from the PHY to the media access controller when
FEC_RXDV is asserted in MII mode operation.
I
Receive Error
FEC_RXER
In Ethernet mode, FEC_RXER—when asserted with
FEC_RXDV—indicates that the PHY has detected an error in the
current frame. When FEC_RXDV is not asserted FEC_RXER has no
effect. Applies to MII mode operation.
I
Table 2-11. Ethernet Module (FEC) Signals (continued)
Signal Name
Abbreviation
Function
I/O
MCF5329 Reference Manual, Rev 3
Содержание MCF5329
Страница 106: ...ColdFire Core 3 32 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 126: ...Enhanced Multiply Accumulate Unit EMAC 4 20 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 148: ...Cache 5 22 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 154: ...Static RAM SRAM 6 6 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 184: ...Power Management 8 18 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 204: ...Reset Controller Module 10 8 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 220: ...System Control Module SCM 11 16 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 228: ...Crossbar Switch XBS 12 8 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 268: ...General Purpose I O Module 13 40 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 392: ...SDRAM Controller SDRAMC 18 30 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 436: ...Fast Ethernet Controller FEC 19 44 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 564: ...Liquid Crystal Display Controller LCDC 22 44 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 594: ...FlexCAN 23 30 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 678: ...Pulse Width Modulation PWM Module 26 22 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 684: ...Watchdog Timer Module 27 6 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 692: ...Programmable Interrupt Timers PIT0 PIT3 28 8 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 704: ...DMA Timers DTIM0 DTIM3 29 12 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 720: ...Queued Serial Peripheral Interface QSPI 30 16 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 754: ...UART Modules 31 34 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 770: ...I2 C Interface 32 16 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 790: ...Message Digest Hardware Accelerator MDHA 33 20 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 866: ...Debug Module 36 50 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 902: ...Register Memory Map Quick Reference A 26 Freescale Semiconductor MCF5329 Reference Manual Rev 3...