参数资料
型号: IP-SLITE2
厂商: Altera
文件页数: 37/110页
文件大小: 0K
描述: IP SERIALLITE II
标准包装: 1
系列: *
类型: MegaCore
功能: SerialLite II 协议
许可证: 初始许可证
3–14
Chapter 3: Parameter Settings
Link Layer Configuration
6. If the timer expires three times in succession, a link error is declared and the link is
restarted. You can control the Timeout limit in the SerialLite II parameter editor,
and it is good practice not to set the time-out to be too long so the system does not
have to wait too long for such situations to resolve. However, do not set the
Timeout to be too short because then the system always times out and the link
never remains up. The time-out value is based primarily on the round trip latency
(that is, from the time a packet is sent to when the ACK is returned to that
transmitter). The exact value of the round trip latency is undetermined, pending
device characterization, but a value of 1,024 columns is recommended.
Implementation of the retry-on-error mechanism is optional for the priority port. If
the Retry-on-error parameter is turned off, no segment acknowledgments are
generated or expected, and all segments are transmitted without any
acknowledgements from the receiver.
Table 3–4 shows the retry-on-error options for the priority data port.
Table 3–4. Retry-on-error Options (Priority Data Port Only)
Option
Turned on
Turned off
Description
Logic is created to acknowledge segments and retransmit segments when errors
occur. Eight transmit segment buffers are created. Available only if the priority
data port is enabled.
Logic is not created to acknowledge segments. Available only if the priority data
port is enabled. This is the default setting.
Retry-on-error Responses
Table 3–5 summarizes the response to various transmission errors.
Table 3–5. Retry-on-error Responses
Error
Invalid 8b/10b codes groups
Running disparity errors
Unsupported valid code groups
CRC errored segments with {EGP} sequence
Out of order segment
Out of order acknowledgment
SerialLite II MegaCore Function
User Guide
Response
Far end transmitter issues NACK
Far end transmitter issues NACK
Far end transmitter issues NACK
Far end transmitter issues NACK
Far end transmitter issues NACK
Near end transmitter starts re-send
January 2014 Altera Corporation
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