參數(shù)資料
型號(hào)： MC92602ZTA
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： SPECIALTY MICROPROCESSOR CIRCUIT, PBGA196
封裝： 15 X 15 MM, 1.60 MM HEIGHT, 1 MM PITCH, MAPBGA-196
文件頁(yè)數(shù)： 42/102頁(yè)
文件大?。?/td> 1581K
代理商： MC92602ZTA
4-2
MC92602 SerDes Reference Manual
MOTOROLA
Rate Adaption Method
Compatible with the Clause 36 specification [5] of the Physical Coding Sublayer
(PCS) and Physical Medium Attachment (PMA) sublayer function.
Compatible with specification for the auto-negotiation function.
The MC92602 compatibility mode is enabled by asserting the control signal, COMPAT,
high.
4.1
Rate Adaption Method
The MC92602 utilizes a FIFO in its receiver to act as an ‘elastic buffer’ for the receive data
interface. The elastic buffer allows for proper operation of the interface in the presence of
jitter and frequency offset. However, frequency offset will eventually lead to elastic buffer
overrun or underrun. In order to prevent underrun and overrun, one or more code groups
must be added to or deleted from the packet stream.
The MC92602 must determine the proper type of code groups to add or delete and do it at
an appropriate time to ensure compatibility with packet data streams. The code group type
and timing is determined by the current context of the packet stream. There are three
contexts considered: configuration, idle, and data transmission.
4.1.1
Configuration Context
The configuration context is when the transceivers are transmitting configuration ordered
sets typically in support of auto-negotiation. A configuration ordered set consists of
alternating /C1/ and /C2/ code group sets as shown below:
/C1/: /K28.5/D21.5/Dxx.x/Dxx.x
/C2/: /K28.5/D2.2/Dxx.x/Dxx.x
where /Dxx.x/Dxx.x/ represent the 16-bit contents of the configuration register. During
auto-negotiation only alternating /C1/ and /C2/ code group sets are expected and the
duration of the auto-negotiation sequence is not bounded. Therefore, rate adaption is
accomplished through the addition and deletion of /C1/ and /C2/ code group sets.
The MC92602, on detection of an imminent overflow, searches for and deletes two /C1/C2/
code group sets, removing a total of 16 code groups (characters) from the packet stream.
The auto-negotiation function is tolerant of missing two complete sets because of its
handshaking protocol. Two complete /C1/C2/ code group sets must be deleted, because, for
a constant configuration register value, a single /C1/C2/ code group set toggles running
disparity. Removing two /C1/C2/ code group sets maintains proper running disparity.
On detection of an imminent underflow, the MC92602 searches for two adjacent /C1/C2/
code group sets with a constant configuration register value and inserts a copy of them into
the packet stream, adding a total of 16 code groups. The auto-negotiation function is
tolerant of additional valid sets because of its handshaking protocol. In order to maintain
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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