REV. 1.2.2 48 5.8.14 Enhanced Feature Register (EFR) - Read/Write Enhanced features are e" />
參數(shù)資料
型號: XR17D154CV-0A-EVB
廠商: Exar Corporation
文件頁數(shù): 43/69頁
文件大?。?/td> 0K
描述: EVAL BOARD FOR XR17D154 144TQFP
標準包裝: 1
系列: *
XR17D154
xr
UNIVERSAL (3.3V AND 5V) PCI BUS QUAD UART
REV. 1.2.2
48
5.8.14
Enhanced Feature Register (EFR) - Read/Write
Enhanced features are enabled or disabled using this register. Bits 0-3 provide single or dual consecutive
character software flow control selection (see Table 19). When the Xon1 and Xon2 and Xoff1 and Xoff2
modes are selected, the double 8-bit words are concatenated into two sequential characters. Caution: note
that whenever changing the TX or RX flow control bits, always reset all bits back to logic 0 (disable) before
programming a new setting.
EFR[3:0]: Software Flow Control Select
Combinations of software flow control can be selected by programming these bits. See Table 19 for complete
selections. The XOFF1/XOFF2 characters are transmitted approximately 2 character times after the RX FIFO
level has reached the RX trigger level, irrespective of which trigger table is used (Trigger Tables A-D). The
XON1/XON2 characters are transmitted when the RX FIFO level falls below the next lower trigger level for
Trigger Tables A-C and they are transmitted when the RX FIFO level falls below the (RX trigger level -
hysteresis level) for Trigger Table D. For example, if Trigger Table D is used with an RX trigger level of 56 and
a hysteresis level of 16, the XON1/XON2 characters are sent when the RX FIFO level count falls below 40.
TABLE 18: 16 SELECTABLE HYSTERESIS LEVELS WHEN TRIGGER TABLE-D IS SELECTED
FCTR BIT-3
FCTR BIT-2
FCTR BIT-1
FCTR BIT-0
RTS/DTR HYSTERESIS
(CHARACTERS)
0
1
± 4
0
1
0
± 6
0
1
± 8
0
1
0
± 8
0
1
0
1
± 16
0
1
0
± 24
0
1
± 32
1
0
± 12
1
0
1
± 20
1
0
± 28
1
± 36
1
0
± 40
1
0
1
± 44
1
0
1
0
± 48
1
0
1
± 52
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