9.3.8.4 TX_FIFO_SIZE_REG Bit Definitions

Table 9-55. TX_FIFO_SIZE_REG (0x40043062)
Bit Number Name Reset Value Function
4 DPB 0 Defines whether double-packet buffering is supported. When ‘1’, double-packet buffering is supported. When ‘0’, only single-packet buffering is supported.
[3:0] SZ[3:0] 0 Maximum packet size to be allowed for (before any splitting within the FIFO of bulk/high-bandwidth packets prior to transmission).
  • 0000: 8 Bytes

  • 0001: 16 Bytes

  • 0010: 32 Bytes

  • 0011: 64 Bytes

  • 0100: 128 Bytes

  • 0101: 256 Bytes

  • 0110: 512 Bytes

  • 0111: 1,024 Bytes

  • 1000: 2,048 Bytes

  • 1001: 4,096 Bytes

If DPB = 0, the FIFO will also be this size; if DPB = 1, the FIFO will be twice this size.