xr16v2651im Exar Corporation, xr16v2651im Datasheet - Page 19

• Manufacturer Part Number: xr16v2651im
• Description: High Performance Duart With 32-byte Fifo And Powersave
• Manufacturer: Exar Corporation

REV. 1.0.2
When software flow control is enabled
characters with the programmed Xon or Xoff-1,2 character value(s). If receive character(s) (RX) match the
programmed values, the V2651 will halt transmission (TX) as soon as the current character has completed
transmission. When a match occurs, the Xoff (if enabled via IER bit-5) flag will be set and the interrupt output
pin will be activated. Following a suspension due to a match of the Xoff character, the V2651 will monitor the
receive data stream for a match to the Xon-1,2 character. If a match is found, the V2651 will resume operation
and clear the flags (ISR bit-4).
Reset initially sets the contents of the Xon/Xoff 8-bit flow control registers to 0x00. Following reset the user can
write any Xon/Xoff value desired for software flow control. Different conditions can be set to detect Xon/Xoff
characters
selected, the V2651 compares two consecutive receive characters with two software flow control 8-bit values
(Xon1, Xon2, Xoff1, Xoff2) and controls TX transmissions accordingly. Under the above described flow control
mechanisms, flow control characters are not placed (stacked) in the user accessible RX data buffer or FIFO.
In the event that the receive buffer is overfilling and flow control needs to be executed, the V2651 automatically
sends an Xoff message via the serial TX output to the remote modem. The V2651 sends the Xoff-1,2
characters two-character times (= time taken to send two characters at the programmed baud rate) after the
receive FIFO crosses the selected trigger level. To clear this condition, the V2651 will transmit the programmed
Xon-1,2 characters as soon as receive FIFO is less than one trigger level below the selected trigger level. (See
Table 8
* After the trigger level is reached, an xoff character is sent after a short span of time (= time required to send 2
A special character detect feature is provided to detect an 8-bit character when bit-5 is set in the Enhanced
Feature Register (EFR). When this character (Xoff2) is detected, it will be placed in the FIFO along with normal
incoming RX data.
The V2651 compares each incoming receive character with Xoff-2 data. If a match exists, the received data will
be transferred to FIFO and ISR bit-4 will be set to indicate detection of special character. Although the Internal
Register Table shows Xon, Xoff Registers with eight bits of character information, the actual number of bits is
dependent on the programmed word length. Line Control Register (LCR) bits 0-1 defines the number of
character bits, i.e., either 5 bits, 6 bits, 7 bits, or 8 bits. The word length selected by LCR bits 0-1 also
determines the number of bits that will be used for the special character comparison. Bit-0 in the Xon, Xoff
Registers corresponds with the LSB bit for the receive character.
characters); for example, after 2.083ms has elapsed for 9600 baud and 10-bit word length setting.
2.15
2.16
RX T
Auto Xon/Xoff (Software) Flow Control
below).
RIGGER
Special Character Detect
16
24
28
(See Table
8
L
EVEL
HIGH PERFORMANCE DUART WITH 32-BYTE FIFO AND POWERSAVE FEATURE
15) and suspend/resume transmissions. When double 8-bit Xon/Xoff characters are
INT P
T
ABLE
IN
A
16
24
28
8
CTIVATION
8: A
(See Table
UTO
X
ON
X
/X
(
OFF
CHARACTERS IN RX FIFO
OFF
15), the V2651 compares one or two sequential receive data
C
19
(S
HARACTER
OFTWARE
16*
24*
28*
8*
(
S
) S
) F
ENT
LOW
)
C
ONTROL
X
(
CHARACTERS IN RX FIFO
ON
C
HARACTER
16
24
0
8
XR16V2651
(
S
) S
ENT
)