MCBSTM32EXL Keil, MCBSTM32EXL Datasheet - Page 901

• Manufacturer Part Number: MCBSTM32EXL
• Description: BOARD EVALUATION FOR STM32F103ZE
• Manufacturer: Keil

Specifications of MCBSTM32EXL

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

RM0008
31 30 29 28 27 26 25
rw rw rw rw rw rw rw
RBS2
Bits 30:29 Reserved
Bits 28:16 RBS2: Receive buffer 2 size
Bits 12:0 RBS1: Receive buffer 1 size
Bit 31 DIC: Disable interrupt on completion
Bit 15 RER: Receive end of ring
Bit 14 RCH: Second address chained
Bit 13 Reserved
●
RDES1: Receive descriptor Word1
When set, this bit prevents setting the Status register’s RS bit (CSR5[6]) for the received frame
ending in the buffer indicated by this descriptor. This, in turn, disables the assertion of the interrupt to
Host due to RS for that frame.
These bits indicate the second data buffer size, in bytes. The buffer size must be a multiple of 4, 8,
or 16, depending on the bus widths (32, 64 or 128, respectively), even if the value of RDES3
(buffer2 address pointer) is not aligned to bus width. If the buffer size is not an appropriate multiple of
4, 8 or 16, the resulting behavior is undefined. This field is not valid if RDES1 [14] is set.
When set, this bit indicates that the descriptor list reached its final descriptor. The DMA returns to the
base address of the list, creating a descriptor ring.
When set, this bit indicates that the second address in the descriptor is the next descriptor address
rather than the second buffer address. When this bit is set, RBS2 (RDES1[28:16]) is a “don’t care”
value. RDES1[15] takes precedence over RDES1[14].
Indicates the first data buffer size in bytes. The buffer size must be a multiple of 4, 8 or 16,
depending upon the bus widths (32, 64 or 128), even if the value of RDES2 (buffer1 address pointer)
is not aligned. When the buffer size is not a multiple of 4, 8 or 16, the resulting behavior is undefined.
If this field is 0, the DMA ignores this buffer and uses Buffer 2 or next descriptor depending on the
value of RCH (bit 14).
24
rw
23 22 21 20 19 18 17 16 15 14 13 12 11 10
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RBS2
Ethernet (ETH): media access control (MAC) with DMA controller
Doc ID 13902 Rev 9
rw rw rw rw rw rw rw rw rw rw rw rw rw
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8
7
RBS
6
5
4
3
2
901/995
1
0