Down Hose Signals; Up Hose Signals - DEC AlphaServer 8200 Technical Manual

Table 6-10 Down Hose Signals
Signal
DND<31:0> L
DNP L
DNDATAVAL L
DNCLK H
DECPKTCNT L
DNRST L
ERROR L
Table 6-11 Up Hose Signals
Signal
UPD<31:0> L
UPCLK H
UPCTL<3:0> L
UPDATAVAL L
UPP L
UPRST L
CBLOK L
PWROK H
Table 6-12 shows the UPCTL<3:0> L encoding.
6-38 I/O Port
Description
Down Data Lines. Asserted by the I/O port. Carry command/address,
data, or transaction status information.
Down Parity. Carry odd parity across DND<31:0>.
Down Data Valid. This line is asserted by the I/O port for each valid
cycle of a Down Hose packet.
Down Clock. The clock signal sent by the I/O port to the I/O bus
adapter.
Decrement Packet Count. Asserted by the I/O port to the I/O bus
adapter to indicate that an Up Hose packet has been removed from the
I/O port's buffer.
Down Reset. Asserted by the I/O port for at least 128 nanoseconds to
reset the logic of the I/O bus adapter.
Error. Used with CBLOK and PWROK to indicate the status of the
hose (see Table 6-13).
Description
Up Data Lines. Asserted by the I/O port. Carry command/address,
data, or transaction status information.
Up Clock. The clock signal sent by the I/O bus adapter to the I/O port.
Up Control Lines. Indicate the packet type during the first hose cycle
of a packet and the mask bits during data cycles of a DMA masked write
packet. The codes for the packet types and mask bits are given in Table
6-12.
Up Data Valid. Asserted by the I/O adapter for each valid cycle of an
Up Hose packet.
Up Parity. Carries odd parity parity across UPD<31:0> and UP-
CTL<3:0>.
Up Reset. If asserted by the I/O bus adapter, causes CCL RESET to be
cycled, thus causing the entire system to be reset. This allows remote
boot capability.
Cable OK. Used with ERROR and PWROK to indicate the status of the
hose (see Table 6-13).
I/O Adapter Power OK. Used with CBLOK and ERROR to indicate
the status of the hose (see Table 6-13).