參數(shù)資料
型號: TSB12LV32-EP
英文描述: IC APEX 20KE FPGA 100K 324-FBGA
中文描述: 軍事增強(qiáng)塑料電機(jī)及電子學(xué)工程師聯(lián)合會1394-1995和P1394a兼容通用鏈路層控制器
文件頁數(shù): 99/106頁
文件大?。?/td> 605K
代理商: TSB12LV32-EP
8
6
address. All status transfers are either 4 or 16 bits unless interrupted by a received packet. The status flags
are considered to have been successfully transmitted to the TSB12LV32 immediately upon being sent, even
if a received packet subsequently interrupts the status transfer. Register contents are considered to have
been successfully transmitted only when all 8 bits of the register have been sent. A status transfer is retried
after being interrupted only if any status flags remain to be sent, or if a register transfer has not yet completed.
The definition of the bits in the status transfer are shown in Table 8
9 and the timing is shown in Figure 8
3.
Table 8
10. Status Bits
BIT(S)
NAME
DESCRIPTION
0
Arbitration Reset Gap
Indicates that the Phy has detected that the bus has been idle for an arbitration
reset gap time (as defined in IEEE Std 1394
1995). This bit is used by the
TSB12LV32 in the busy/retry state machine.
1
Subaction Gap
Indicates that the Phy has detected that the bus has been idle for a subaction gap
time (as defined in IEEE Std 1394
1995). This bit is used by the TSB12LV32 to
detect the completion of an isochronous cycle.
2
Bus Reset
Indicates that the Phy has entered the bus reset start state.
3
Interrupt
Indicates that a Phy interrupt event has occurred. An interrupt event may be a
configuration time-out, cable-power voltage falling too low, a state time-out, or a
port status change.
4
7
Address
This field holds the address of the Phy register whose contents are being
transferred to the TSB12LV32.
8
15
Data
This field holds the register contents.
00
00
(a)
01
(b)
00
00
S[14:15]
S[0:1]
D0, D1
CTL0, CTL1
SYSCLK
Figure 8
3. Status Transfer Timing
The sequence of events for a status transfer is as follows:
Status transfer initiated. The Phy indicates a status transfer by asserting status on the CTL lines
along with the status data on the D0 and D1 lines (only 2 bits of status are transferred per cycle).
Normally (unless interrupted by a receive operation), a status transfer will be either 2 or 8 cycles
long. A 2-cycle (4-bit) transfer occurs when only status information is to be sent. An 8-cycle
(16-bit) transfer occurs when register data is to be sent in addition to any status information.
Status transfer terminated. The Phy normally terminates a status transfer by asserting idle on the
CTL lines. The Phy may also interrupt a status transfer at any cycle by asserting receive on the
CTL lines to begin a receive operation. The Phy shall assert at least one cycle of idle between
consecutive status transfers.
8.4
Whenever the Phy detects the data-prefix state on the serial bus, it initiates a receive operation by asserting
Receive on the CTL terminals and a logic 1 on each of the D terminals (data-on indication). The Phy indicates
the start of a packet by placing the speed code (encoded as shown in Table 8
11 on the D terminals, followed
by packet data. The Phy holds the CTL terminals in the receive state until the last symbol of the packet has
Receive Operation
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