DS3134 datasheet(113/203 Pages) DALLAS

113 / 203 page

DS3134

113 of 203

Receive Done Queue Internal Address Storage Table 8.1.4A

Acronym

Address

Receive Done Queue Base Address 0 (lower word)

RDQBA0

0730h

Receive Done Queue Base Address 1 (upper word)

RDQBA1

0734h

Receive Done Queue DMA Write Pointer

RDQWP

0740h

Receive Done Queue Host Read Pointer

RDQRP

073Ch

Receive Done Queue End Address

RDQEA

0738h

Receive Done Queue FIFO Flush Timer

RDQFFT

0744h

Note:

1) Receive Done Queue End Address is not an absolute address. The absolute end address is “Base +

RDQEA * 4 ”.

Receive Done Queue Structure Figure 8.1.4B

Once the Receive DMA is activated (via the RDE control bit in the Master Configuration register; see

Section 4 for more details), it can begin writing data to the Done Queue. It knows where to write data

into the Done Queue by reading the Write Pointer and adding it to the Base Address to obtain the actual

32-bit address. Once the DMA has written to the Done Queue, it increments the Write Pointer by one

dword. A check must be made to make sure the incremented address does not exceed the Receive Done

Queue End Address. If the incremented address does exceed this address, then the incremented write

pointer will be set equal to 0000h (i.e. the Base Address).

dmardq

Base + 00h

Base + 04h

Base + 08h

Base + 0Ch

Base + 10h

Base + 14h

Base + End Address

Done Queue DMA Write Pointer

Done Queue Host Read Pointer

Maximum of 65536

Done Queue Descriptors

DMA Readied

Done Queue Descriptor

DMA Readied

Done Queue Descriptor

DMA Readied

Done Queue Descriptor

DMA Readied

Done Queue Descriptor

Host Processed

Done Queue Descriptor

Host Processed

Done Queue Descriptor

Host Processed

Done Queue Descriptor

DS3134 датащи(PDF) 113 Page - Dallas Semiconductor

DS3134 датащи(HTML) 113 Page - Dallas Semiconductor

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL