Datasheet

XIO2213B
www.ti.com SCPS210F –OCTOBER 2008–REVISED MAY 2013
8.31 Link Control Register
The link control set/clear register provides the control flags that enable and configure the link core protocol
portions of the controller. It contains controls for the receiver and cycle timer. See Table 8-23 for a
complete description of the register contents.
OHCI register offset: E0h set register
E4h clear register
Register type: Read/Set/Clear/Update, Read/Set/Clear, Read only
Default value: 00X0 0X00h
BIT NUMBER 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
RESET STATE 0 0 0 0 0 0 0 0 0 X X X 0 0 0 0
BIT NUMBER 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
RESET STATE 0 0 0 0 0 X X 0 0 0 0 0 0 0 0 0
Table 8-23. Link Control Register Description
BIT FIELD NAME TYPE DESCRIPTION
31-23 RSVD R Reserved. Bits 31-23 return 0 0000 0000b when read.
22 cycleSource RSC When bit 22 is set to 1b, the cycle timer uses an external source (CYCLEIN) to determine when to
roll over the cycle timer. When this bit is cleared, the cycle timer rolls over when the timer reaches
3072 cycles of the 24.576-MHz clock (125 s).
21 cycleMaster RSCU When bit 21 is set to 1b and the controller is root, it generates a cycle start packet every time the
cycle timer rolls over, based on the setting of bit 22 (cycleSource). When the controller is not root,
regardless of the setting of bit 21, the controller accepts received cycle start packets to maintain
synchronization with the node that is sending them. Bit 21 is automatically cleared when bit 25
(cycleTooLong) in the interrupt event register at OHCI offset 80h/84h (see Section 8.21) is set to
1b. Bit 21 cannot be set to 1b until bit 25 (cycleTooLong) is cleared.
20 CycleTimerEnable RSC When bit 20 is set to 1b, the cycle timer offset counts cycles of the 24.576-MHz clock and rolls
over at the appropriate time, based on the settings of the previous bits. When this bit is cleared,
the cycle timer offset does not count.
19-11 RSVD R Reserved. Bits 19-11 return 0 0000 0000b when read.
10 RcvPhyPkt RSC When bit 10 is set to 1b, the receiver accepts incoming PHY packets into the AR request context
if the AR request context is enabled. This bit does not control receipt of self-ID packets.
9 RcvSelfID RSC When bit 9 is set to 1b, the receiver accepts incoming self-ID packets. Before setting this bit to 1b,
software must ensure that the self-ID buffer pointer register contains a valid address.
8-7 RSVD R Reserved. Bits 8 and 7 return 00b when read.
6
(1)
tag1SyncFilterLock RS When bit 6 is set to 1b, bit 6 (tag1SyncFilter) in the isochronous receive context match register
(see Section 8.46) is set to 1b for all isochronous receive contexts. When bit 6 is cleared, bit 6
(tag1SyncFilter) in the isochronous receive context match register has read/write access.
5-0 RSVD R Reserved. Bits 5-0 return 00 0000b when read.
(1) This bit is reset by PERST or FRST.
Copyright © 2008–2013, Texas Instruments Incorporated 1394 OHCI Memory-Mapped Register Space 157
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