參數(shù)資料
型號(hào)： MSX340-PB480
元件分類(lèi)： 數(shù)字信號(hào)處理外設(shè)
英文描述： DSP-CROSSBAR SWITCH, PBGA480
封裝： PLASTIC, BGA-480
文件頁(yè)數(shù)： 3/61頁(yè)
文件大?。?/td> 1437K
代理商： MSX340-PB480
MSX Family Data Sheet
I-Cube, Inc.
[Rev. 1.10] 9/5/01
11
1.3
Control Signals
Every port on the MSX devices has two available global clock inputs, input enables, and output enables.
However, not all ports have access to the same global control signals. There are four global clocks
(CLK_0 through CLK_3), four global input enables (IE_0 through IE_3), and four global output enables
(OE_0# through OE_3#). Each global control signal is available to half of the ports on the MSX device.
Table 2 below shows the global control signals that are available to each port.
1.4
RapidConfigure Interface
The MSX family of Digital Crosspoint Switches can be configured in either of two ways. Both the JTAG
serial programming interface and the RapidConfigure (RC) parallel interface can assign crosspoint
connections and configure I/O Buffers (IOBs), but JTAG is slower. JTAG runs reliably up to 8 MHz and
requires over twenty cycles to program a single command. The RapidConfigure interface can run at up to
40 MHz and can send a new command on every clock cycle. Systems requiring frequent reconfiguration
should be designed to use the RapidConfigure interface.
RapidConfigure is a 29 signal parallel interface that effectively flattens the serial JTAG bitstream. Rather
than consecutively shifting in twenty or so bits of data to configure an IOB or make a crosspoint
connection, all of these bits are driven on the RC lines simultaneously and then latched in by the MSX
device in a single cycle. Additionally, the MSX RapidConfigure interface has been enhanced to enable
reading back of configuration data from the device.
The 29 pins are allocated as follows:
RCA[9:0] = RapidConfigure Address A
RCB[9:0] = RapidConfigure Address B
RCC[3:0] = RapidConfigure Program Variable C
RCI[1:0] = RapidConfigure Instruction Bits
RC_CLK = RapidConfigure Clock
RC_EN# = RapidConfigure Cycle Enable
RC_RDY = Read out IOB and connect/disconnect status
1.4.1
Signal Description
The RC interface supports four types of operations. Two are write operations to the MSX (IOB
configuration or crosspoint programming) and two are read operations (IOB and crosspoint
configuration read). The RC signals serve different purposes depending upon the type of
operation being performed.
Table 2
MSX Global Control Signals
MSX340 Port
Number
MSX532 Port
Number
Input/Output
Clock Source 1
Input/Output
Clock Source 2
Input
Enable 1
Input
Enable 2
Output
Enable 1
Output
Enable 2
Ports 0-84
Ports 0-132
CLK_0
CLK_1
IE_0
IE_1
OE_0#
OE_1#
Ports 85-169
Ports 133-265
CLK_1
CLK_2
IE_1
IE_2
OE_1#
OE_2#
Ports 170-254
Ports 266-398
CLK_2
CLK_3
IE_2
IE_3
OE_2#
OE_3#
Ports 255-339
Ports 399-531
CLK_3
CLK_0
IE_3
IE_0
OE_3#
OE_0#
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