MOD5234-100IR NetBurner Inc, MOD5234-100IR Datasheet - Page 378

• Manufacturer Part Number: MOD5234-100IR
• Description: MOD5234 10/100 ETHERNET MODULE
• Manufacturer: NetBurner Inc
• Type: Controllers & Processorsr

Specifications of MOD5234-100IR

• Interface: I²C, SPI, UART
• Voltage - Supply: 2.5V
• Mounting Type: Surface Mount
• Package / Case: Module
• Product: Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Data Format: -
• Baud Rates: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: Q4483564

Fast Ethernet Controller (FEC)
19.2.4.6 MII Management Frame Register (MMFR)
The MMFR is accessed by the user and does not reset to a defined value. The MMFR register is
used to communicate with the attached MII compatible PHY device(s), providing read/write
access to their MII registers. Performing a write to the MMFR will cause a management frame to
be sourced unless the MSCR has been programmed to 0. In the case of writing to MMFR when
MSCR = 0, if the MSCR register is then written to a non-zero value, an MII frame will be
generated with the data previously written to the MMFR. This allows MMFR and MSCR to be
programmed in either order if MSCR is currently zero.
19-14
Address
Reset
Reset
Bits
1
0
W
W
R
R
—
—
31
15
ETHER_EN When this bit is set, the FEC is enabled, and reception and transmission are possible.
ST
RESET
Name
—
—
30
14
Figure 19-7. MII Management Frame Register (MMFR)
—
—
Table 19-8. ECR Field Descriptions (Continued)
29
13
When this bit is cleared, reception is immediately stopped and transmission is stopped
after a bad CRC is appended to any currently transmitted frame. The buffer descriptor(s)
for an aborted transmit frame are not updated after clearing this bit. When ETHER_EN is
deasserted, the DMA, buffer descriptor, and FIFO control logic are reset, including the
buffer descriptor and FIFO pointers. The ETHER_EN bit is altered by hardware under the
following conditions:
When this bit is set, the equivalent of a hardware reset is performed but it is local to the
FEC. ETHER_EN is cleared and all other FEC registers take their reset values. Also, any
transmission/reception currently in progress is abruptly aborted. This bit is automatically
cleared by hardware during the reset sequence. The reset sequence takes approximately
8 system clock cycles after RESET is written with a 1.
OP
• ECR[RESET] is set by software, in which case ETHER_EN will be cleared
• An error condition causes the EIR[EBERR] bit to set, in which case ETHER_EN will be
cleared
—
—
28
12
—
—
27
11
MCF5235 Reference Manual, Rev. 2
—
—
26
10
PA
25
—
—
9
IPSBAR + 0x1040
—
—
24
8
DATA
23
—
—
Description
7
—
—
22
6
—
—
21
5
RA
—
—
20
4
—
—
19
3
Freescale Semiconductor
—
—
18
2
—
—
17
1
TA
16
—
—
0