MSC8113 Reference Manual, Rev. 0
25-72
Freescale Semiconductor
Ethernet Controller
TBPTR contains the low-order 32 bits of the next transmit buffer descriptor address.This register
takes on the value of TBASE when the TBASE register is written by software.
TBASE is the register to which you write the TxBD base address. The value must be divisible by
eight for 8-byte data BDs or by 32 for 32-byte data BDs.
TBPTR
TxBD Pointer
Bit
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
TBPTR
Type
R/W
Reset
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
Bit
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
TBPTR
-—
Type
R/W
R
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Table 25-42. TBPTR Bit Descriptions
Bit
Reset
Description
TBPTR
0-28
0
Transmit Buffer Descriptor Pointer
The TBPTR register is internally written by the DMA module. The value increments by eight
(bytes) or 32 (bytes), subject to ECNTRL[DBDS], each time a descriptor is read from memory.
In 32-byte mode (ECNTRL[DBDS] is set), this field must be 32-byte aligned. This means that bits
27 and 28 are reserved in 32-byte mode.
—
29-31
0
Reserved. Write to zero for future compatibility.
TBASE
Transmit Descriptor Base Address
Bit
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
TBASE
Type
R/W
Reset
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
Bit
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
TBASE
-—
Type
R/W
R
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Table 25-43. TBASE Bit Descriptions
Bit
Reset
Description
TBASE
0-28
0
Transmit Descriptor Base Address
Defines the starting location in the memory map for the Ethernet controller TxBDs. In 8-byte mode
(ECNTRL[DBDS] is cleared), this field must be 8-byte aligned. In 32-byte mode (ECNTRL[DBDS]
is set), this field must be 32-byte aligned so that bits 27 and 28 are reserved in 32-byte mode. In
addition to setting the W (wrap) bit in the last BD, you can select how many BDs to allocate for the
transmit packets. You must initialize TBASE before enabling the Ethernet controller transmit
function.
—
29-31
0
Reserved. Write to zero for future compatibility.
Summary of Contents for MSC8113
Page 1: ...MSC8113 Reference Manual Tri Core 16 Bit Digital Signal Processor MSC8113RM Rev 0 May 2008 ...
Page 20: ...MSC8113 Reference Manual Rev 0 xx Freescale Semiconductor Contents ...
Page 28: ...MSC8113 Reference Manual Rev 0 xxviii Freescale Semiconductor ...
Page 56: ...MSC8113 Reference Manual Rev 0 1 28 Freescale Semiconductor MSC8113 Overview ...
Page 76: ...MSC8113 Reference Manual Rev 0 2 20 Freescale Semiconductor SC140 Core Overview ...
Page 134: ...MSC8113 Reference Manual Rev 0 4 30 Freescale Semiconductor System Interface Unit SIU ...
Page 168: ...MSC8113 Reference Manual Rev 0 6 18 Freescale Semiconductor Boot Program ...
Page 180: ...MSC8113 Reference Manual Rev 0 7 12 Freescale Semiconductor Clocks ...
Page 260: ...MSC8113 Reference Manual Rev 0 8 80 Freescale Semiconductor Memory Map ...
Page 300: ...MSC8113 Reference Manual Rev 0 9 40 Freescale Semiconductor Extended Core ...
Page 304: ...MSC8113 Reference Manual Rev 0 10 4 Freescale Semiconductor MQBus and M2 Memory ...
Page 308: ...MSC8113 Reference Manual Rev 0 11 4 Freescale Semiconductor SQBus ...
Page 590: ...MSC8113 Reference Manual Rev 0 17 46 Freescale Semiconductor Interrupt Processing ...
Page 614: ...MSC8113 Reference Manual Rev 0 18 24 Freescale Semiconductor Debugging ...
Page 622: ...MSC8113 Reference Manual Rev 0 19 8 Freescale Semiconductor Internal Peripheral Bus IPBus ...
Page 724: ...MSC8113 Reference Manual Rev 0 21 32 Freescale Semiconductor UART ...
Page 920: ...MSC8113 Reference Manual Rev 0 25 150 Freescale Semiconductor Ethernet Controller ...
Page 1171: ...MSC8113 Reference Manual Rev 0 Freescale Semiconductor C 61 EF wait_rts P 01077FFC 9F rts 71 ...
Page 1172: ...MSC8113 Reference Manual Rev 0 C 62 Freescale Semiconductor MSC8113 Boot Code ...
Page 1202: ...MSC8113 Reference Manual Rev 0 Index 30 Freescale Semiconductor Index ...