參數(shù)資料
型號(hào)： MESC-ST1
廠商： Lineage Power
英文描述： Enhanced Services Controller，Statistics Monitor - 65535 Connections(可統(tǒng)計(jì)檢測(cè)65535個(gè)連接的增強(qiáng)型服務(wù)控制器)
中文描述： 增強(qiáng)服務(wù)控制器，統(tǒng)計(jì)監(jiān)測(cè)- 65535連接（可統(tǒng)計(jì)檢測(cè)65535個(gè)連接的增強(qiáng)型服務(wù)控制器）
文件頁(yè)數(shù)： 12/31頁(yè)
文件大?。?/td> 182K
代理商： MESC-ST1
August 2000
MESC_ST1
MACRO
Data Sheet
Logic Design Solutions
12/28
1011 : e_stat_8 EE_VCX dependant
1100 : e_stat_9
Set 3
1101 to 1111: not used
All data are 16-bits wide. So the SDRAM required is a 8Meg x 16, which is a very standard device.
All SDRAM accesses are under control of one state machine. It manages SDRAM initialisation and refresh, as well as CPU
access and statistics update.
1.5
E.S.I. interface
The MESC_ST1 is only connected to the E.S.I. 16-bits output data bus. The ESSYNC signals is also used to synchronise the
frame received from the APC.
The ESI output is a repeating frame of length 34 cycles, which corresponds exactly to an APC internal timeslot. In a single
timeslot the APC can perform between zero and one of each of the four cell enqueue/dequeue operations.
1)
Enqueue a single cell from the Utopia interface on Ingress
2)
Dequeue a single cell to the Fabric interface on Ingress
3)
Enqueue a single cell from the Fabric interface on Egress
4)
Dequeue a single cell to the Utopia interface on Egress
The MESC_ST1 will monitor events associated with this operation.
If the ESSYNC pulse is missing the associated cell will not be processed.
The fields which will be extracted, as a subset of the complete ESI frame, to support the statistics given earlier, are listed below.
IE_ relates to Ingress Enqueue events.
ID_ to Ingress Dequeue events.
EE_ to Egress Enqueue events.
ED_ to Egress Dequeue events.
The position of each field within the frame is also given. Cycles within the ESI frame are numbered 0 to 33, with the high pulse
on ESSYNC marking the position of Word 0.
Field
Word
7
25
22
0
Bits
15:0
15:0
15:0
15:0
IE_VCX[15:0]
ID_VCX[15:0]
EE_VCX[15:0]
ED_VCX[15:0]
This is the unique identifier for each enabled connection. A VCX of 0xFFFF is a NULL VCX, ie. no enqueue or dequeue event
took place.
Field
IE_S
ID_S
EE_S
ED_S
Word
4
26
31
30
Bits
5
0
15
3
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