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MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
14-21
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
0
0
0
0
0
MAX_FL
W
Reset
0
0
0
0
0
1
0
1
1
1
1
0
1
1
1
0
Address
Base + 0x0084
16 17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R
0
0
0
0
0
0
0
0
0
0
FCE BC_REJ PROM
MII_
MODE
DRT LOOP
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
Address
Base + 0x0084
Figure 14-11. Receive Control Register (RCR)
Table 14-14. RCR Field Descriptions
Bits
Name
Description
0–4
—
Reserved, should be cleared.
5–15
MAX_FL
Maximum frame length. Resets to decimal 1518. Length is measured
starting at DA and includes the CRC at the end of the frame. Transmit frames
longer than MAX_FL will cause the BABT interrupt to occur. Receive frames
longer than MAX_FL will cause the BABR interrupt to occur and will set the
LG bit in the end of frame receive buffer descriptor. The recommended
default value to be programmed by the user is 1518 or 1522 (if VLAN Tags
are supported).
16–25
—
Reserved, should be cleared.
26
FCE
Flow control enable. If asserted, the receiver will detect PAUSE frames.
Upon PAUSE frame detection, the transmitter will stop transmitting data
frames for a given duration.
27
BC_REJ
Broadcast frame reject. If asserted, frames with DA (destination address) =
FF_FF_FF_FF_FF_FF will be rejected unless the PROM bit is set. If both
BC_REJ and PROM = 1, then frames with broadcast DA will be accepted
and the M (MISS) bit will be set in the receive buffer descriptor.
28
PROM
Promiscuous mode. All frames are accepted regardless of address
matching.
29
MII_MODE
Media independent interface mode. Selects external interface mode. Setting
this bit to one selects MII mode, setting this bit equal to zero selects 7-wire
mode (used only for serial 10 Mbps). This bit controls the interface mode for
both transmit and receive blocks.
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