ST16C554DCQ-0A-EB Exar Corporation, ST16C554DCQ-0A-EB Datasheet - Page 7

• Manufacturer Part Number: ST16C554DCQ-0A-EB
• Description: EVAL BOARD FOR ST16C554D 64TQFP
• Manufacturer: Exar Corporation

Specifications of ST16C554DCQ-0A-EB

• Interface Type: UART
• Data Bus Width: 8 bit
• For Use With/related Products: ST16C554D
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

REV. 4.0.1
The CPU interface is 8 data bits wide with 3 address lines and control signals to execute data bus read and
write transactions. The 554 data interface supports the Intel compatible types of CPUs and it is compatible to
the industry standard 16C550 UART. No clock (oscillator nor external clock) is required for a data bus
transaction. Each bus cycle is asynchronous using CS# A-D, IOR# and IOW# or CS#, R/W#, A4 and A3 inputs.
All four UART channels share the same data bus for host operations. A typical data bus interconnection for
Intel and Motorola mode is shown in
F
2.0 FUNCTIONAL DESCRIPTIONS
2.1
IGURE
3. ST16C554 T
CPU Interface
UART_RESET#
UART_CS#
UART_IRQ#
UART_RESET
UART_CSC#
UART_CSD#
UART_CSA#
UART_CSB#
UART_INTC
UART_INTD
UART_INTA
UART_INTB
R/W#
A0
A1
A2
D0
D1
D2
D3
D4
D5
D6
D7
A4
A3
IOW#
IOR#
VCC
D0
D1
D2
D3
D4
D5
D6
D7
A0
A1
A2
YPICAL
I
NTEL
VCC
Motorola Data Bus (68 Mode) Interconnections
Intel Data Bus (16 Mode) Interconnections
/M
Figure
OTOROLA
3.
(no connect)
(no connect)
(no connect)
D
VCC
VCC
ATA
7
B
US
16/68#
16/68#
IOW#
CSB#
CSC#
CSD#
IOW#
CSA#
IOR#
CSC#
CSD#
RESET
IOR#
INTD
RESET#
CSA#
CSB#
INTA
INTB
INTC
INTD
INTA
INTB
INTC
D0
D1
D2
D3
D4
D5
D6
D7
D0
D1
D2
D3
D4
D5
D6
D7
A0
A1
A2
A0
A1
A2
2.97V TO 5.5V QUAD UART WITH 16-BYTE FIFO
I
NTERCONNECTIONS
Channel D
Channel C
Channel A
Channel B
Channel D
Channel C
Channel A
Channel B
UART
UART
UART
UART
UART
UART
UART
UART
DTRA#
DSRA#
RTSA#
CTSA#
to Ch A
to Ch A
to Ch A
Similar
Similar
Similar
CDA#
to Ch A
to Ch A
to Ch A
GND
Similar
Similar
Similar
DTRA#
DSRA#
RIA#
RTSA#
CTSA#
VCC
TXA
RXA
CDA#
GND
RIA#
VCC
TXA
RXA
VCC
VCC
Serial Interface of
Serial Interface of
Serial Interface of
RS-232
Serial Interface of
RS-232
RS-232
ST16C554/554D
RS-232