參數(shù)資料
型號(hào): STP2202ABGA
元件分類: 微控制器/微處理器
英文描述: SPECIALTY MICROPROCESSOR CIRCUIT, PBGA320
封裝: BGA-320
文件頁(yè)數(shù): 59/106頁(yè)
文件大?。?/td> 519K
代理商: STP2202ABGA
56
STP2202ABGA
Dual Processor System Controller
DSC
June 1998
Sun Microsystems, Inc
Figure 39. 12NSec Same SIMM Group Read<->Write Timing
-1 0
1
2
3
4
5
6789
10
Bank0 Bank1
11
Cycle ends at 10
0,12,3 4,5 6,7
12
-2
56
7
9
float01
1
2
4
35
Bank0Bank1
0,12,3 4,5 6,7
Limiting factor is RAS precharge for 4 clocks between write and following read.
Same Read -> Write time is 28 clocks at 83 MHz or 381 MBytes/Sec
Same Rd->Wr timer is programmed for clock 11
13 14 15 16
dead
dead0
12
3
4
8
1
6
7
17 18 19 20
Lab measurements show that the first write stretch point holds for data for 3 clocks
Same Wr->Rd timer is programed for clock 15
Limiting factor is that UPA data bus requires one clock of float between masters
21 22 23 24
8
9
10 11
dead
25 26 27 28
dead
0
dead
MWB
MRB
because the read data must be unloaded from the XB1 before the write can start.
When write follows read XB1 comand is delayed by one clock
0ns
50ns
100ns
150ns
200ns
250ns
300ns
350n
Snoop CLk
PM-req
XB1-MP cmd
MRB/MWB-ctrl
wr/
RAS/
Addr(ROW)
CAS0/
CAS1/
BankSel
DRAM Data
UPA Data
PingPong
Stretch
Snoop Clk
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