STP2001QFP Sun Microelectronics, STP2001QFP Datasheet - Page 4

• Manufacturer Part Number: STP2001QFP
• Description: Integrated SBus Interface Slave I/O Controller
• Manufacturer: Sun Microelectronics

STP2001.frm Page 4 Monday, August 25, 1997 2:46 PM
S
SBus Interface: 54 Pins
EBus Interface: 15 pins
SB_D[31:0]
SB_ACK[2:0]
SB_CLK
SB_RD
SB_SEL
SB_SIZ[2:0]
SB_AS
CHIP_SEL
SB_PA[V:Z]
SB_PA[16]
SB_PA[4:0]
EB_D[7:0]
EB_ADDRLATCH
EB_RD
EB_WR
TOD_CS
EPROM_CS
GENERIC_CS
GENERIC_RDY
1. The CHIP_SEL pin is an additional qualifier (active low) to the SB_SEL line. When sharing a single SBus select line with another
2. In some system configurations, the high order physical address bits can be connected as follows: SB_A[V, W, X, Y, Z]=PA[24:20].
4
IGNAL
device (such as the STP2000QFP), one of the high order SBus physical address lines, such as PA[27], can be tied to the CHIP_SEL
pin to distinguish between the two devices.
STP2001QFP
Signal
Signal
D
[1]
[2]
ESCRIPTIONS
3-State
Output
Output
Output
Output
Output
Output
Type
Input
Input
Input
Input
Input
Input
Input
Input
Input
Type
Input
I/O
I/O
Slave I/O
Integrated SBus Interface Slave I/O Controller
SBus Data Bus
SBus Acknowledge
SBus Clock Input
SBus Read/Write
SBus Select
SBus Transfer Size
SBus Address Strobe (address is valid)
High order physical address bits (for slave decodes)
High order physical address bits (for slave decodes)
PA[16] (for system/user selection in INT/TMR)
Low order physical address bits
EBus data
EBus address latch
EBus read
Ebus write
TOD chip select
EPROM chip select
Generic port chip select
Generic port ready (25 A pull-up)
Description
Description
July 1997