Altera POS-PHY Level 4 IP Core Manual de usuario descargar pdf (Pagina 30)

3–10 Chapter 3: Parameter Settings

Optional Features

POS-PHY Level 4 IP Core User Guide December 2014 Altera Corporation

f For more information, refer to “Status Processor” on page 4–7.

FIFO RAM Blocks

The option to select 2 FIFO RAM blocks depends on the parameters you select on the

Basic Parameters tab. These parameters affect the FIFO buffer size and FIFO buffer

width, both of which play a role in memory utilization.

When you select 2 FIFO RAM blocks, the timing performance of the IP core may

decrease (because the memory

rdata

bus is unregistered, as opposed to registered for

4 FIFO RAM blocks). Altera recommends that you do full compilations for both

configurations before deciding which one to choose.

1 Use 2 FIFO RAM block only if it gives an improvement in memory utilization and if

your timing requirements are still met.

Table 3–3 shows the support for the 2 FIFO RAM block. 4 FIFO RAM block supports

all configuration.

Hungry Starving or Hungry Hungry

Hungry Satisfied Satisfied

Satisfied Any Satisfied

Table 3–3. User-Controlled Option (Part 2 of 2)

User Status Value FIFO Buffer Status Value Sent Status Value

Table 3–4. 2 RAM Block Support

Data Flow

Direction

Buffer Mode Data Path Width

Atlantic Interface

Width

Lite Transmitter 2 RAM Block Support

Receiver Any Any Any — Yes

Transmitter

Shared Buffer

with Embedded

Addressing

32 — No

64 — Yes

64 Any No

128

Yes Yes

No No

128 128 Any No

Individual

Buffers

Any Any Any Yes

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 141 142

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