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參數(shù)資料
型號(hào)： TSB12C01AWN
廠商： Texas Instruments, Inc.
英文描述： High-Speed Serial-Bus Link-Layer Controller
中文描述： 高速串行總線鏈路層控制器
文件頁(yè)數(shù)： 21/59頁(yè)
文件大小： 275K
代理商： TSB12C01AWN
3–5
Table 3–3. Control-Register Field Descriptions (Continued)
BITS
ACRONYM
FUNCTION NAME
DESCRIPTION
18–19
Reserved
Reserved
Reserved
20
CyMas
Cycle master
When CyMas is set and the TSB12C01A is attached to the root phy, the
cyclemaster function is enabled. When the cycle_count field of the cycle
timer register increments, the transmitter sends a cycle-start packet.
This bit is not cleared upon bus reset. When another node is selected as
root during a bus reset, the transaction layer in the now nonroot
TSB12C01A node must clear this bit and the transaction layer in the
TSB12C01a node selected as root must set this bit.
21
CySrc
Cycle source
When CySrc is set, the cycle_count field increments and the
cycle_offset field resets for each positive transition of CYCLEIN. When
CySrc is cleared, the cycle_count field increments when the cycle_offset
field rolls over.
22
CyTEn
Cycle-timer enable
When CyTEn is set, the cycle_offset field increments.
23
CyMrkEn
Cycle mark enable
When CyMrkEn is set, cycle marks are inserted into GRF at the end of
each isochronous cycle (TSB12C01A compatible). When CyMrkEn is
cleared, no cycle marks are generated.
24
IRP1En
IR port 1 enable
When IRP1En is set, the receiver accepts isochronous packets when
the channel number matches the value in the IR Port1 field.
25
IRP2En
IR port 2 enable
When IRP2En is set, the receiver accepts isochronous packets when
the channel number matches the value in the IR Port2 field.
26–30
Reserved
Reserved
Reserved
31
RevAEn
Rev A enable
When set, RevAEn enables the output of GRFEMP, CYDNE, and CYST.
When not set, these outputs are in a high-impedance state, which makes
TSB12C01A pin-compatible with the TSB12C01. This bit is 0 on power
up.
3.2.4
The interrupt and interrupt-mask registers work in tandem to inform the host bus interface when the state
of the TSB12C01A changes. The interrupt register is at address 0Ch. The interrupt mask register is at
address 10h. The interrupt mask register is read/write. Its initial value is 0000_0000h. When regRW is
cleared to 0, the interrupt register (except for the Int bit) is write to clear. When regRW (in diagonstics register
at 20h) is set to 1, the interrupt register (including the Int bit) is read/write. Its initial value is 1000_0000h.
Interrupt and Interrupt-Mask Registers
The interrupt bits all work the same. For example, when a phy interrupt occurs, the PhInt bit is set. When
the PhIntMask bit is set, the Int bit is set. When the IntMask is set, the INT signal is asserted. The logic for
the interrupt bits is shown in Figure 3–2. Table 3–4 defines the interrupt and interrupt-mask register field
descriptions. As shown in Figure 3–2, the INT bit is the OR of interrupt bits 1 – 31. When all the interrupt
bits are cleared, INT equals 0. When any of the interrupt bits are set, INT equals 1, even when the INT bit
was just cleared.
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