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| 型號： | MC92602ZTA |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | SPECIALTY MICROPROCESSOR CIRCUIT, PBGA196 |
| 封裝： | MAPBGA-196 |
| 文件頁數(shù)： | 41/98頁 |
| 文件大小： | 896K |
| 代理商： | MC92602ZTA |
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4-2
MC92602 SERDES Reference Manual
MOTOROLA
Rate Adaption Method
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: conguration, idle and data transmission.
4.1.1
Conguration Context
The conguration context is when the transceivers are transmitting conguration ordered
sets typically in support of auto-negotiation. A conguration 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 conguration 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, upon detection of an imminent overow, 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 groups sets must be deleted, because,
for a constant conguration register value, a single /C1/C2/ code group set toggles running
disparity. Removing two /C1/C2/ code group sets maintains proper running disparity.
Upon detection of an imminent underow, the MC92602 searches for two adjacent /C1/C2/
code group sets with a constant conguration 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
proper running disparity as described above, two complete /C1/C2/ code group sets must
be added to the packet stream.
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| MC92603VF | 功能描述:IC TXRX ETH QUAD GIG 256-MAPBGA RoHS:否 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:25 系列:- 類型:收發(fā)器 驅(qū)動器/接收器數(shù):2/2 規(guī)程:RS232 電源電壓:4.5 V ~ 5.5 V 安裝類型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:16-PDIP 包裝:管件 |
| MC92603VM | 功能描述:IC ETH TXRX QUAD GIG 256-MAPBGA RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 類型:收發(fā)器 驅(qū)動器/接收器數(shù):2/2 規(guī)程:RS232 電源電壓:3 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR) |
| MC92604VM | 功能描述:IC ETH TXRX DUAL GIG 196-MAPBGA RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 類型:收發(fā)器 驅(qū)動器/接收器數(shù):2/2 規(guī)程:RS232 電源電壓:3 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR) |
| MC92604ZT | 功能描述:IC TXRX ETH DUAL GIG 196-MAPBGA RoHS:否 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:25 系列:- 類型:收發(fā)器 驅(qū)動器/接收器數(shù):2/2 規(guī)程:RS232 電源電壓:4.5 V ~ 5.5 V 安裝類型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:16-PDIP 包裝:管件 |
| MC92610 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:Quad 3.125 Gbaud SERDES |
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