PM7367 datasheet(51/323 Pages) PMC

51 / 323 page

PM7367 FREEDM-32P32

DATA SHEET

PMC-1991499

ISSUE 2

FRAME ENGINE AND DATA LINK MANAGER

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMER’S INTERNAL USE

Packet Descriptor Reference Ready (RPDRR) queue and the Receive Packet

Descriptor Reference Small and Large Buffer Free (RPDRF) queues.

The RMAC copies packet data to data buffers in host memory. The RPD, RPDR,

RPDRR queue, and Small and Large RPDRF queues are data structures which

are used to transfer host memory data buffer information. All five data structures

are manipulated by both the RMAC and the host computer. The RPD holds the

data buffer size, data buffer address, and packet status information. The RPDR

is a pointer which is used to index into a table of RPDs. The RPDRR queue and

RPDRF queues allow the RMAC and the host to pass RPDRs back and forth.

These data structures are described in more detail in the following sections.

Receive Packet Descriptor

The Receive Packet Descriptors (RPDs) pass buffer and packet information

between the RMAC and the host. Both the RMAC and the host read and write

information in the RPDs. The host writes RPD fields which describe the size and

address of data buffers in host memory. The RMAC writes RPD fields which

provide number of bytes used in each data buffer, RPD link information, and the

status of the received packet. RPDs are stored in host memory in a Receive

Packet Descriptor Table which is described in a later section. The Receive

Packet Descriptor structure is shown in Figure 4.

Figure 4 – Receive Packet Descriptor

Reserved (18)

Next RPD Pointer [13:0]

Status [5:0]

RCC [6:0]

Data Buffer Start Address [31:0]

Receive Buffer Size [15:0]

Bit 31

Bytes In Buffer [15:0]

Reserved (16)

Offset[1:0]

Table 6 – Receive Packet Descriptor Fields

Field

Description

Data Buffer Start

Address[31:0]

The Data Buffer Start Address[31:0] bits point to the data

buffer in host memory. This field is expected to be

configured by the Host during initialisation.

The Data Buffer Start Address field is valid in all RPDs.

PM7367 Datasheet(PDF) 51 Page - PMC-Sierra, Inc

PM7367 Datasheet(HTML) 51 Page - PMC-Sierra, Inc

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

Datasheet Download

Link URL