MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
14-30
Freescale Semiconductor
14.3.4.3
FIFO Receive Bound Register (FRBR)
The FRBR is a 32-bit register with one 8-bit field that the user can read to determine the upper address
bound of the FIFO RAM. Drivers can use this value, along with the FRSR register, to appropriately divide
the available FIFO RAM between the transmit and receive data paths.
0 1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Address
Base + 0x0144
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
0
0
0
0
X_WMRK
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Address
Base + 0x0144
Figure 14-20. FIFO Transmit FIFO Watermark Register (TFWR)
Table 14-23. TFWR Field Descriptions
Bits
Name
Descriptions
0–29
—
Reserved, should be cleared.
30–31
X_WMRK
Number of bytes written to transmit FIFO before transmission of a frame begins
0x 64 bytes written
10 128 bytes written
11 192 bytes written
0 1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Address
Base + 0x014C
16 17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R
0
0
0
0
0
0
R_BOUND
0
0
W
Reset
0
0
0
0
0
1
1
0
0
0
0
0
0
0
0
0
Address
Base + 0x014C
Figure 14-21. FIFO Receive Bound Register (FRBR)
Summary of Contents for MPC5553
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