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A storage module is accessed through an arrangement of buffers which are associated with individual requestors (such as processors or I/O channels).
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Storage System With Request-Oriented Buffers
A storage module is accessed through an arrangement of buffers which are
associated with individual requestors (such as processors or I/O channels).
Storage module BSM 1 consists of a storage array 10, whose dynamic
storage cells are periodically refreshed by a refresh and priorty control 11, of a
storage for protection keys 12, of an error correction circuit 13, and of a unit 14
for key storage and port control. Buffer unit BU2 is attached to I/O bus 15 of
BSM 1 and comprises a number of buffers 20a to 20f, all of which are connected
in parallel to bus 15. Each of these buffers has a relatively small capacity (e.g., 8
words, whose width corresponds to that of bus 15) and is associated with a
particular unit requesting data from the BSM. Thus, buffer 20a services BSM
requests for microcode instruction words from a microprocessor, buffers 20b to
20d service requests for instructions and first and second operands, respectively,
from a processor, and buffers 20e and 20f service channel requests for channel
command words CWW and I/O data, respectively. BU2 has appropriate buses
21a to 21c for attaching different requestors.
Buffers 20 support read-only and read/write accesses to BSM 1 and are
transparent in their operation to the requestors. Each buffer 20 is associated
with buffer control circuits for filling and emptying the buffers. Via control lines
22a, 22b, 22c, the buffer control circuits cooperate with unit 14 in B...