参数资料
型号: STP1081ABGA-150
元件分类: 微控制器/微处理器
英文描述: SPECIALTY MICROPROCESSOR CIRCUIT, PBGA256
封装: PLASTIC, BGA-256
文件页数: 6/32页
文件大小: 478K
代理商: STP1081ABGA-150
14
STP1081
Preliminary
Companion Device for 250/300 MHz UltraSPARC-II Systems
UltraSPARC
-II Data Buffer (UDB-II)
July 1997
Data Transfer Timing Diagrams
The timing diagrams which follow show data transfers from the UPA to the UltraSPARC-II and from the
UltraSPARC-II to the UPA. Arrows indicate when data is registered at the UDB-II except when otherwise
noted. These diagrams portray signal timing for minimum latency.
Two-to-Three Clock Ratio for Data Transfer
Figure 8 shows the most common data transfer case. For UPA-to-CPU data transfer, the operation begins with
S_REPLY, which is clocked at the rising edge of SYS_CLK, corresponding to time t0. At time t1, the next rising
edge of SYS_CLK, the data is latched into UDB-II. In other words (given that there is no data stall), UDB-II
will take what is on the UPA bus on the next SYS_CLK rising edge following S_REPLY.
The processor requests the data in UDB-II by asserting CNTL. Note that one whole EBUS_CLK cycle must
complete after SYS_CLK rise where the data was latched, before CNTL can be asserted. Once this cycle com-
pletes, CNTL is given at the rising edge of EBUS_CLK.
Two cycles later, the requested data packet appears at the output of UDB-II (the same as the microprocessor
input.)
For CPU-to-UPA data transfer, the processor sends CNTL and E$_DATA at the same time. When UPA
requests the data, S_REPLY may be asserted as little as two cycles after data is latched, and that data appears
at the output of UDB-II two cycles later.
Note the following differences:
The S_REPLY is only given once for every transaction, one cycle before the data is latched into UDB-II. How-
ever, CNTL is given for every E$_DATA and during the same cycle as E$_DATA.
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